1997-2004 Ford F150 4X4 Inoperative In Depth Diagnosis 

There truly is nobody better at explaining these jobs better than you. Thank you for being so thorough and helping all of us who are just trying to keep our trucks running so we can continue to work.

man you saved my butt. stuck out in the mountains middle of no where with no four wheel drive. got on you tube and watched your video found the problem in the reservior and was able to patch the problem and get home

A sincere thank you from all of us who love our Fords but need a little help now and again. You are legit bro!

Man, a 7 year old video saves so much time... I appreciate the information you provide, ohms etc. Great to take a few minutes to see what your checking before going out to work on stuck 4 Low in the rain... Thank you sir!

Thoroughly enjoy your efforts. I look forward to your videos daily. Not because I have any issues with my 06 Explorer but I'm always looking to learn. Your training abilities are awesome!

I got a 2002 F150 4x4,got stuck on a road during deer season,had to get pulled out n towed home,thanks to your video I was able to trouble shoot the problem myself,ended up finding my vacuum lines going down to my actuator wer broken n brittle,i'm very thankful I was able to find your video

Great video! I followed the vacuum all the way down to the vacuum switch that moves the control arm that engages the front axles but the pin on vacuum switch was not moving. After moving the pin in and out manually about 20 times by prying on the control arm with a screw driver the mechanical was easier to move. The pin on the vacuum switch actually started moving in and out like it was designed to move. Lesson here for me is probably to engage 4 WD more often so the control arm does not get stuck from lack of use Thanks for your awesome video!

Love your videos, watched a few and fixed my four wheel drive yesterday. It was a vacuum issue, I had a clogged check valve right before the solenoid. 05 F-150 Lariat. Couldn't have fixed it myself without your awesome videos, keep up the good work!!

Great video. I have searched high and low for a comprehensive diagnostics video I could use to help me with my problems on my 1998 F150. I don't mind buying parts as long as I know it will fix the problem. With your help I think I can nail it down once and for all. I did find another good video someone did about cleaning the contacts on the selector switch which I will do first. Between the two I am confident I can finally get things working as they should. Good work man and thanks.

Thanks so much! I have taught school and aviation instruction and you are an excellent teacher for Auto tech stuff. You are very clear, concise and easy to understand. You go slow enough for us who are just learning the system, even though you fully understand it. That is a sign of someone who KNOWS HOW TO INSTRUCT! Nicely done. Thanks for the help!

I sure appreciate your video on this. I wish I could have had internet connection on the mountain today to see this helpful information. I made it out with help from other guys. I could have diagnosed and fixed my problem on the trail with this video. Thank you.

Wow. I'm amazed that every video you make is so clearly explained and helpful with good audio/video quality

This is the most thorough and useful auto maintenance video I've seen so far. Thank you, well done.

you are a real credit to the RU-vid community. Thanks for your videos!

Hi FordTechMakuloco. Great video ! Did all the checks for the solenoids and no ground to the 4wd solenoid. All other electrics from GEM are functioning except that one and when you put the switch in 4wd it would click on the right side of the dash 4 times then do nothing, no light, no 4wd and it would only do it once for each power up of the key. Crawled underneath and the transfer case motor was pretty rusty looking and tried tapping it with a hammer but did no good. Bought a new Dorman motor and installed it, reset the computer by disconnecting the battery and the first time it did not work. Powered the key on and off a few times with the switch set to 4wd and wholla, all works fine on the jack stands now. Took it for a test ride after dinner and it works like new, both in high and low range. Thanks a million !!

Man, your videos are amazing. 10/10...I’ve learned A LOT about Fords over the past year or so thanks to you! Thank you FTM!! Next time I pass through Illinois I’d love to stop in and check out BSG Automotive!

Man what an awesome video, well explained, well done, really appreciate it.

My used F-150 4WD never worked, but now I know what that relay clicking from behind the steering wheel when I first started it was going on.

This was an awesome video. Thanks for your time filming this.

Very informative..I haven't physically started diagnosing yet, (same symptoms) but your video is greatly appreciated. thank you!! easy and simple to understand.

thank you so much for this. I troubleshooted this perfectly. my next question, how do you troubleshoot the engagement of the actual transfer case when you shift into 4wd? thanks!

How about the diagnostics for an F-250 Super Duty

Thank you for literally the best DIY mechanic videos on the Internet. I used your 4 part video to replace and time the 4.0L in my 2005 Explorer. I do not think I would have been successful without your videos. I have one question on this video. I ran all the tests on my 2000 F150 (4X4 will not engage) Everything works except when I get to the last test. When I raise the front end, the drivers side wheel will spin freely in 2 an 4 wheel drive. The passenger side binds in 2 and 4 wheel drive. (when in 2 or 4 and in park with the engine running). I can see the passenger side CV axel bind at the front differential. But what is weird is I can drive the truck. No issues with binding when in drive or reverse. One other thing to note: I had the passenger side ball joint snap this summer and had to replace the passenger CV axel shaft as well as the ball joints all around.

Great Video. Thanks!! Really good to see the drawings and specs flow. It really makes sense when I can flow through the system when testing and operating. Awesome Bruddah!! I actually go through your videos about every week. I find really all of them helpful as heck info. Really great video library. Can't believe I missed this puppy. Oh well, it's a whole better late than never.

Good overall presentation. Very informative and helpful! :-)

another great video. well done. your starting to be my new favorite tech. thanks again.

Excellent video! Simple and easy to follow and understand. Now I have to go to the truck and try these tests! Thank you...

Great video. Thank you for sharing this. You just helped me diagnose and fix my 99 F150. When I hooked vacuum to just the bottom port of 4x4 solonoid, had no vacuum from top port. Changed 4x4 Solonoid ($25) and it works perfectly!

This was very clear And very informative very good job thank you

I just wanna say God bless you good job

Thank you I recently bought 2001 f150 that was sitting for a little bit,it's a good truck with high miles and gaskets seals and sensors is what I'm going through. Awesome intake video replacement you provided and that's what I'm doing next is oil filter coolant gasket and then making it goes into 4wd properly. Thank you again your knowledge and effort are well received, Thank you

Awesome video. Thx for the info. This was very thorough and easy to understand. I'm in the Obx and was attempting to go onto the "4x4 drive on beach". I turned the switch to 4H and nothing happened. Ended up having to get towed out of the sand. Got back to the house, watched your video and turns out my actuator was stuck. I manually depressed it a few times and now everything is working fine. I use RU-vid for a lot of the do-it yourself videos and I must say this is one of the best I've seen!!! Thx again.

Could you send me that diagram. I'm having issues with my 2002. I turn the selector and I hear nothing . No clicking of any kind when I select 4h or 4L any help. Would be awsome. Thanks ahead of time. If you need my email or FB messenger let me know.

great video thanks for sharing :D

Thanks for the tips. I was stuck in 2 wheel drive the other day in the mud. I'm going to check these and see what's going on

This is awesome!! Figured out what was wrong with my 4wd. Very informative and easy to understand. Thanks

I personally never had an issue with manual hubs and a lever. I would very much like to give the inventor of these yuppified systems a proper thrashing. I wouldn't mind it so much if was optional, but it's no any more on the 150's to the best of my knowledge.

by far the best 4x4 info for 97-03 f150 4x4, nice job young man.

THANK YOU!!! I've been trying to find that diagram for 2 weeks. I tore apart the engine and everything in my engine bay and couldn't figure out what the 2 solenoids up front were for.

I was able to diagnose the problem I was having after watching this video. This was a great help, thank you.

Thanks for the video. I have a Ford 1998 Expedition XLT 4.6L with 2H/AWD/4H/4L knob. For this past week was the first time that I used 4L to get out of the snow in about 16 years. I thought I had it in 4L. Place in neutral and switched from 2H to 4L. Only the 4X4 light came on. The “Low” light did not. Drove some and everything was cool. Then, tried backing into my driveway, I heard this really loud noise like high pitched fast gringing. Put her in neutral, shifted back to 2H and threw her in reverse and drove backward for 20 ft. 4x4 light went off and all seemed ok. The truck has been my daily driver in 2H 99% of the time that I have had her. Doesn’t snow much or get terribly cold in Hampton roads va. Was at a stop light the next day. Put her in neutral, shifted from 2H to 4L and then drive, I felt the transmission switch up and heard it too. Drove the rest of the way home over ice and snow. Once I got home, I tried taking it out of 4L by going into neutral, switching back to 2H and shifting to reverse and driving 20 ft in reverse. This time it wouldn’t switch back to 2H. Seems that I’m stuck in 4L. I tried unplugging the battery and no go. 4x4 light went off but the transmission being in this mode now makes the truck feel sluggish. I’ve noticed that when switching the knob to 2H AWD or any other setting I do not hear the clicking relay in the dash like I did three days ago. The 4x4 light no longer turns on. AWD light does but I don’t feel the transfer case switching around. Right now, I hear a whine going down the road at 20-30 mph. Have not exceeded 35 mph and my overdrive light is flashing now. My coworker thinks I need to wait until it warms up and smack the electronic transfer case motor with a hard rubber mallet to see if it’ll shift back. Any thoughts on how I can resolve this. I have not driven it since the OD light started flashing because I have read that I can damage the transmission by driving on dry, smoothe roads in 4L. Bought the truck with 28k miles on it back in Feb 2000. Got 199k miles on the original engine and transmission on it. Never raced or towed anything with my truck. Not in the market to pay 60k on a new expedition now, and really cringing at the idea of shelling out $2k or more on transmission issue on a truck that may not be worth $1k. Any ideas? Appreciate any and all help. This is the coldest weather that truck has seen since I’ve had it temps ranging from 9° to 24°F for the past 5 days.

Thank You First of all! My problem starts with the 2 wheel solenoid Power on the positive and negative side and when the key is off still grounded on the negative while testing from the positive battery terminal. Also Power on the 4x4 positive terminal and no reading on the negative solenoid terminal regardless of key and 4x4 switch position. No light on the dash , no clicking etc. Thinking about replacing the gem module? great Video gives me confidence.respectfully John

Guys like you are what really make youtube shine.

Nice video and clear explanations. Would love to see you do a video of a 2004 Expedition 4 x 4 system, as it is much different than what you have shown here. I've replaced everything possible and still not engaging.

Awesome write up, helped me not throw unneeded parts at my beater truck. Fixed my 4x4 for under $15. Now if i could find a easy fix to stop the leaky fuel tank.

Wow! What a complete easy to follow video! Great job. It has given me direction. I have '97 5 speed with no 4wd engagement. When I got in it after being parked for a month it was already in 4wd and worked solid. After putting it in 2wd a few minutes later (with the floor lever since there is no dash selection switch nor dash light), it will not return to 4wd. Transfer case engages, I have power at #23 fuse, and vacuum on both bottom hoses. Just no ground on either solenoid in any lever position. Is this related to the switch inside my transfer case perhaps or am I chasing the GEM?

Thanks for the guide. I found out my 4WD solenoid was bad today following your steps and $26 later I had 4WD again.

Hi. Thanks for the video. I’ve did the checks you’ve talked about. The problem I’m seeing is that I don’t have a switch ground from either wiring harness.

You are the man, GOAT, of ford mechanics. I'll buy you dinner whenever I meet you in life. Thanks so much sir.

Thank you for the video about the four by four it's helped me a lot I still need help with a question I'm hearing something clicking underneath the dash as soon as I turn the key and then I can not engage the four by four

Yes definitely an awesome channel and video. My 2001 just started not going into 4x4 today. Havent had a chance to look at it yet but the light is not turning on and i dont hear the Tcase motor actuator engage. I do hear the relays clicking behind the dash though

Thankyou for information. I have a 2001 f150 that wants to shift front axle by it self without actually shifting in to 4x4 mostly when engine is off. Im going to test the actuator on front drive shaft and check the canister by battery. I've checked all vacuum lines and all good so this video is a good start. I have also change the shift motor because it also stop working and I can hear it working now with the relay clicking when I turn the switch. I can shift it into 4x4 but it will sometimes stay locked in even with switch set in 2 wheel with indicator light's off. I'll let you know what I find out. Thanks

Thanks for the video . I need to get the front vacuum actuator. The 2 wheel side works but 4 wheel does not. But was wondering how much vacuum there should. It all seems to work but just seems a little week. Vacuum would hold a piece of paper when I put up to end of hose, but pretty easy to pull away. Thanks

Man I must say your site and help on transfercase was verry informational and I'm sure it will help me pinpoint a few things * .thank you

Without a doubt best done how-to-diagnose vid I've seen on any part/system

Thanks for the video, really informative and helpful. I went through this, having a problem of 4 wheel drive not engaging. Flip the switch and nothing. I have vacuum to the solenoids, but none leaving to the actuator. I have power to solenoids but neither is grounded regardless of the 4 wheel drive switch selection. From reading other comments I'm detecting a pattern of get the GEM codes read, I'll do that, but is there anything else to check. All fuses are good.

Thanks for the great video. I followed your video and received the power to both terminals but have no ground. What should my next step be- I don’t hear any noise in the dash when I switch back and forth. Working on 97 f150

Thanks for all that detailed info. My question is I have a 2001 ford f150. Is there a reason my 4x4 wont engage on an incline?

WOW,, you have a very well display to check. I will be checking daylight tomorrow to find the problem. Front actuator working but slower than yours demonstrated. Transfer case working as it goes in low. Now to see if it is the front drive of the transfer case or the actuator. Thank you so much. Be in touch as I find out.

Thank you so much for posting this video. Your step by step instruction was very helpful in allowing me to test system by system and ultimately repairing my 4Wd provblem for just $46 in parts! Happy New Year!

1999 f150. 4x4 light up on dash, could feel the transfer case engage via floor shifter. Front drive shaft is locked in. Front wheels were free spinning while jacked up. Checked the 4x4 engage, and disengage vacuum solenoids. Both coils measured around 73 Ohms, had 12 volts to both connectors, but both were showing ground in 4x4 and 2x4 positions. The one on the right side was working, allowing vacuum to flow when 2x4 was engaged, the one on the left wouldn't work in either position. I switched the right one with left one , and the left with the right one, and plugged the vacuum lines back in, and the electrical connection back in( They only fit into the correct solenoids due to a slot on the connector). I engaged the transfer case with truck running, and still jacked up, and spun my wheel. My other wheel spun, YAY! I don't know if this will cause issues down the road somewhere or not, but I now have a fully functional 2 & 4 wheel drive system again. It works as it should, so I can't see why I would have any issues. It's PERFECT!!!! Thanks man for pointing me in the right direction. I would have been days, or given up on it without your video.

Thanks for this video, I do have a question, I am getting the constant power to both solenoids but I am not getting the ground to either one, in 2wd or 4wd, what is my next step? Thanks again!

verry well done there, I found a faulty 2wd celenoid after only 8min off watching your video thx, the faulty one was stuck open so 4x4 would not engage, I really need a 4x4 for tomorow because a big snow storm is on the way so I just bypass the celenoid for now and block the vacum line with a screw until I have time to find and replace the parts. thx again

Thanks for this info, much appreciated. I would like a diagram of the 4wd mechanical switch at the axle to see why it is stiff.

Best video and explanations I've ever seen on this. Thanks

Your awesome Mr Makuloco! Very helpful and very detailed thank you

Thanks for the video. Checking on my 4x4 a little later. I get the in dash GEM clicks and the 4x4 light comes on but no sound underneath and obviously the 4x4 doesn't work. Hoping it's a vacuum issue. (99 XLT)

thanks my friend, your a big help. My problem is the acuator is going all the way in and out when i jack it up running (98f150 floor shifter) but going down the road it wants to creep to 4x4 and the light goes on and hear clunk in front pumkin area preceeded by a squeel. i took off the rubber boot and oiled it good bringing it in and out jacked up thinking it might be intermittent binding at the acuator

Awesome information! I have a 98 f150 with the same system as the truck in the video. Im getting no lights on the dash to indicate thats in in 4wd but it is shifting like its in 4low. The odd thing is, the front axles are not engaging. I replaced the vacuum actuator and both Solenoids up by the battery with no change.

when applying 4x4, sometimes I can heard a loud crunch underneath in or out. Today I applied 4x4 low and drove approx 250 yards before I heard the loud crunch (it sound like someone driving a stranded and don't know how to change gears) and got 4x4 low, high use to work with the same loud crunch, now its not working, after seeing your video, seeing that the problem is intermittent, I will change the vacuum solenoids, and look for creaks in the black box behind the batteries. will let you know how it went

This is an excellent video. Everything from the video checks out, including the vacuum reservoir behind the battery but I have an old problem and a new one. The old problem: 4x4 works fine until I accelerate then it will kick out and back in randomly, quite violently, but it's just fine low speed, low rpm. New problem: Now, also when accelerating the air from the vents will blow into defrost until I let off the throttle, so I'm thinking both are vacuum related and the only thing left I can think of is the vacuum check valve from the diagram but where is it located? Also, does the check valve sound like a good suspect for these problems?

Hey FordTechMakuloco! Awesome video, man! As I was diagnosing my 1998 ford expedition, I noticed that the vehicle would only switch from 2H to 4H occasionally. I replaced the shift motor recently, and when 4H indicator did show on dash, I could hear the shift motor engage as well. I performed all the other tests on this video as instructed and everything else checked out. Could this be a bad GEM module? Thanks for all the help!

love your videos. could you show the replacement of the gem module for a 98 expedition?

He has very good and informative videos I traced the vacuum from the axle to the solenoids, I checked the electric good, vacuum good, four by four solenoid wasn't working I tapped on it with a screwdriver end and it started working has been working for over a hundred fifty thousand miles more I have 240 thousand miles. A good thing to do is exercise your 4 by 4 once a month or every other month it keeps the solenoid from drying out.

Thanks for the great information. Apparently I have other issues since I have voltage to both solenoids however no matter which position I turn the switch to I always have a ground on the 2 wheel solenoid. I also do not hear the transfer case shift motor running. It was bad last year and I changed it. The 4 wheel drive worked for a short time and now I don't have anything but 2 wheel operation. I would appreciate any diagrams or troubleshooting tips you could give me.

i have a 97 explore 5 speed 4x4 the switch says auto 4hi 4low i turn it on hi seems good lights up on dash good but stoped in neutral when i try low no change 4x4 light is on if i go from auto strait to 4low no light and no 4x4

great video. i tried everything you showed and i still cant get my truck to go into 4x4. i am not getting a ground signal from the 4x4 connector. i swapped connector with one at a junk yard but still no ground. what do i do next?? please help

Your video was awesome thank you so much..I have a 97 expedition EB. I can get her into 4x4 in all 3 modes but after 10min or so the indicator light will start flashing between 4 x 4 and 4AWD then eventually stick in 4-wheel drive and nothing will happen when I move the switch. The only way I can get it out of 4 wheel drive is to disconnect the battery. I went around for a few months in 2 wheel drive not needing four wheel drive but when I went to engage it it would not.. thought I would start where I left off so I disconnected the battery and low and behold it would then go into 4 wheel drive.. this has gone on and on so I ordered a battery disconnect switch so I could pop in and out if four-wheel drive when I wanted to..in my mind I'm now thinking it could simply be the dash mounted 4 wheel drive switch. Your thoughts would be greatly appreciated

This video is extremely useful and I enjoyed learning how the system works. I have a 2004 F150 FX4 AND need more information. My 4 wheel drive engages okay but the 4 wheel light indicator will flash on for one second and turn off. When I first turn the ignition on the 4 wheel light is bright and clear. Please give me the repair solution.

hey great video thank u for the info . question for u can I move the lever on the motor by hand to test the 4x4 I'm gonna look at a 02 4x4 and the guy said it had a vacuum hose issue n I wanted to make sure the 4x4 worked aka transfer case

Great video, very detailed. I have a 1999 Expedition AWD and 4 wheel drive, so it never is just two wheel drive. It is stuck in 4 wheel drive. The selector switch is functioning correctly when I switch it back to all wheel out of 4 wheel the light goes off for 4 wheel but i dont here any clicking like i do from 4 wheel low to high. Do you have any suggestions on what I can try. Thank you for your time

Thank you so much for your explanation of the system. I have a 2004 F150 Lariat and when I change the selector button of the 4x4 system I don’t sense anything happening. I’ll check everything you showed in the video to see if I resolve my problem. Thanks again sir.

I just finished your video. Thanks for taking the time to make it. I have reviewed everything you pointed out in the video. It's all working correctly but my 4x4 still isn't engaging. What's my next step?

Great in depth video. After confirming all your points my front wheels will not lock up. Any suggestions?

Best video I have seen on 4wd.

My particular problem on my 2003 Lariat SuperCrew is my 4x4 works pretty much just fine in dry conditions, only issue is it doesn’t always come out of 4Lo but I rarely if ever use 4Lo. However- in wet/icy/snowy conditions, my 4x4 will usually engage after a few minutes, then disengage, then re-engage, then disengage, etc. without me ever touching the switch. Switch stays in 4Hi, and it engages and disengages itself whenever. Usually disengages every single time I really need it. sometimes it wont even engage in the first place, or I have to let it sit for a few minutes then try to engage the 4wd. I live just outside of Denver in CO, which as I’m sure you can guess, we get quite a bit of snow and ice in winter, and not having 4x4 when I need it is a very big deal for me, and it isn’t very safe at all. I am thinking it is probably the Transfer Case Motor, but also don’t jut want to throw parts at it, because in my experience I just end up spending the money I was trying to save on more parts or just doing what I should’ve done in the first place, taking it into the shop. Anyway, if you could give me your opinion on what the problem could be or what you think is most likely the problem, I would greatly appreciate it. Thanks dude.

thank you for the excellent video, I have similar noise at (2007 Navigator ) the driver side, only in 4x4 mode and driving a circle, driving straight give me also a rough drive feeling but no noise. I did all the tests you recommend and everything work how it should, except the noise (which stop switching back to 2 wheel drive mode) the rough drive feeling keep going one for some time. I replace all oils in rear - front axle (differential) and transfer case as well with original Ford oil, ... no change .....do you have an idea,....thank you

Great videos. What I've discovered is I have power on both actuator feeds. I have ground on one actuator but not the other. I flipped the switch and heard the motor turn then I checked to see if I had ground and I still have ground on the same one I had ground on. It didn't switch. I'm assuming already that I have a bad gem and I wired up a 2 throw switch directly to the 2 shift motor wires and I connected the 2 brown wires by the tcase. I left the square plug connector unplugged. Does the square plug control the shift actuators? Trying to figure out why the ground won't switch when I flip the switch

would you mind doing a video going over a "tour" of the 97-03 4x4 entire vacuum system? Just going through the vacuum hoses and their connections. that would be great. you do an awesome job.

Thank you. Thank you. Thank you. My 02 4x4 Expedition has been acting up the last couple days and I am almost positive based on this video that the answer is in this video. Thank you. Subscribed.

Great video. On the actuator, besides the two vacuum lines you pointed out, there is a fat hose. I traced that hose up and it is not connected and near the two solenoids. About half way up at a connecting joint it goes into a smaller line that is about the size as the hoses in the solenoids. Is it intentionally not connected to anything?

I've done everything you recommended, all my vacuum supplies are ok. The only problem is my collar do not move. What else would you recommend me to do next?

Thank you fro your video, I do have a question. I was having an issue moving the actuator and replaced both solenoids and now the vacuum control is working. The actuator is pulling to the (passenger side) 4wd but the diff is not locking, thoughts?. I don't think the transfer case shift motor is not working either.

Thanks for the videos, they are really helpful. Older post so not sure if you will be seeing this but since you were nice enough to offer help at the end, here goes. I get nothing at all when I turn the shift on the fly selector switch on my '03. Fuses are good (23 and 104). Selector switch has the correct resistance at all positions per the ford shop manual. NO clicking noise from the transfer case relay under the dash. The 2wd solenoid has constant power and ground, the 4wd solenoid has constant power but never gets ground when I turn the selector switch (which makes sense if the relay does not work). I went to my local pick-n-pay and pulled two relays and neither of them made a difference, so I assume not the relay. GEM module is not "wet" per other posts I have read. Any thoughts are appreciated!

Hello FordTechMakuloco. Thank you for the video. I followed along and found that the 4wd solenoid shows ground with the key off. Does this point to a GEM problem or is it more likely a wiring issue?

Hey there! very in depth video with great info! i have a 97 f150 xlt 4x4 with 5.4L and ESOF. having a really hard time figuring out what is wrong with the 4x4. was stuck in 4wd-low and changed t-case shift motor. manually switch back over to 2wd-hi and put shift motor back on. Now, shift motor wont shift and 4wd light in dash is stuck on and 4wd low will randomly turn on and wont turn off until i shift to neutral. Having a really hard time with this. Any help?

FordTechMakuloca I've followed your instructions. I get to where I'm checking the 4x4 solenoid.. With key on and trans case to 4x4 (manual shift) I get no voltage on the ground side. Meaning when I put my test light on the + post and check for the ground on the 4x4 solenoid (left pin if looking at the face of the connector) I get no voltage when I move the transfer case in the 4x4 position. I also do not have an indicator light up on the dash. But the trans case does go into 4x4. I can hear it and feel it. What do I need to check when not getting voltage to that solenoid when I switch to 4x4?

Very good video thanks for sharing your knowledge your videos are very helpful

Hi Makuloco. I was viewing your video 1997-2004 Ford F150 4X4 Inoperative In Depth Diagnosis I own a 2003 F150 4x4 and its stuck in LOW RANGE.. I found 3 things: 1.-Cant hear the clicks when changing from 4L to 4H to 2H. 2.-Break green vacuum hose that goes from 4x4 solenoid to the actuator 3.-When selecting 2H the 4x4 solenoid (left side) still getting ground from GEM.. How can I know if there is a problem in the GEM or in the 4x4 Switch? No blown fuses by the way..

Thanks for the uploaded videos and sharing your knowledge I have 2003 F150 fx4.. in yoir diagnosis video @17:31I am not getting a good ground from the GEM...?? Bad GEM?