How to Test an Alternator ( Testing the Voltage Regulator, Diode rectifier and Stator)

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This video will cover the following
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How to test an alternator using multi meter
How to replace an alternator
How to diagnose alternator charging issues
Alternator ripple test
How to test a voltage regulator in an alternator
How to replace bearing in an alternator ( Alternator brush replacement )
how to test a rectifier in an alternator
How to test diodes pack in an alternator
How ecu controlled / computer controlled alternators work
How to test drive belts in a car
How to replace a decoupler pulley
Diagnosing no charge , undercharging , overcharging alternator with multimeter
How to fix a rattling alternator
How to test fuses and relays
How to test alternator duty cycle
How PWM ( pulse width modulation basics ) works
How to read waveforms
why your battery light is on
How to find a voltage drop
how to use a multimeter
How to find a overnight parasitic battery drain
How to repair an alternator and finally, Deciding on brand new vs remanufactured
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Опубликовано:

19 июн 2024

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Комментарии : 917

@JunkyDIYguy 5 лет назад

Guys, check out my latest video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-UG54xt56uZo.html

@tattedone6753 5 лет назад

I have a question about my vehicle do you have a email I can message you at?

@djeletropopstarify 4 года назад

I have kind of dirty but perfectly working alternator, but it's kind of plug up with all kind of junk is there proper way to clean the alternator inside component's? and what it's proper way to do it

@azizmakka7126 3 года назад

Very helful vidios

@azizmakka7126 3 года назад

Sar. plese show me how to chek ulternet motor (capacitor) rely

@waziraliwazirali6095 3 года назад

@davidbarlow269 2 года назад

I am an electrical engineer of some 40 years experience. Your presentation is excellent. Your English is very good. Your video skills are very good. I like the use of gloves , I like your camera skills. Top marks...

@gradyrm237 10 месяцев назад

100% the best alternator video on the internet. This cat showed me how to test everything in the circuit. Testing the pins on the connectors was a massive help. I needed to know if the PCU was sending the signal to the alternator first of all. Taking the alternator apart is out of my wheel house. I just needed to pinpoint my defective part. This homie crushed it.

@BlackwaterDSM Год назад

Hands down, one of the most informational and concise videos I’ve ever watched. The only way he could tell you more about an alternator is to show you how they wrap the copper up into a spool. Came here due to an overcharging alternator (first one OVERcharging in my 38 years of being a driveway mechanic) and was able to diagnose it thanks to this video. Thank you for such an awesome video!

@lukula2934 11 месяцев назад

Could not agree more. It goes to show how many YT "experts" only know enough to be dangerous.....

@BlackwaterDSM 11 месяцев назад

@@lukula2934 Right?! They help you out, alright…. Help you right i to the back of an Ambulance (or Hearse). 😬😬😬

@joeblow1711 7 месяцев назад

I agree!

@konquer247 6 лет назад

It's people like that makes RU-vid a great source of information. Thank you for your efforts.

@arunadevi4734 4 года назад

You are Knowledge Hub. Great....

@d.d4184 3 года назад

I am a technician,and this video very good with correct information. Not sure why anyone would give you a thumbs down.

@lucianoferreira613 3 года назад

My car stopped while driving. Thanks to two of your videos I diagnosed a bad connection between the positive terminal of the alternator and the battery ,gosh, I'm even speaking like a pro :) , I would like to give you a thumbs up for every euro you saved me. Thanks bro!

@jeremyyang7234 4 года назад

This is the most detailed instruction for testing alternator I have ever seen.Thanks a lot.

@TR4zest 5 лет назад

I found myself pausing frequently to try to absorb all your excellent information. Wow. Thank you.

@yyxx5088 3 года назад

your patience, dedication and keenness to detail is much appreciated

@a.bax.5992 4 года назад

I've watched quite a few DIY videos on RU-vid and this is by far one of the most detailed and clear.

@danmaryam8201 2 года назад

Very educative

@bobczz3919 4 года назад

This is the BEST video I have seen on the charging system. I never buy a new alternator or starter. I always rebuild them for a few bucks. I will not pay 300 or more for a new alternator or starter. Thank you for such an informative video.

@nil4309 4 года назад

Definitely the best video on this! Not only explains what to test, but why - and exactly what each component should be doing. Thank you

@andysmith7758 4 года назад

This is a GREAT tutorial! Technically right on, and thorough demonstartions and explanations! You know your stuff, DIY Junky! Thank you so very much!

@RS-yj3gn 3 года назад

This must be the best tutorial i have seen. Easy to follow and well illustrated. Thanks so much!

@randyinchesapeake8129 3 месяца назад

Now THIS; in my humble opinion, is what the internet was created for. To SHARE INFORMATION! (at one time called "the information superhighway") And this man did a damned good job of it!

@Etheo1ify Год назад

The most detailed video on how to test, diagnose and repair an alternator. Thank you!

@elebeu Год назад

I especially appreciated the testing of the cables and ground for voltage drops. These are often overlooked and and multiple, small, voltage drops can add up to trouble.

@CarAudioInc 7 лет назад

the effort you put into these videos is phenomenal

@JunkyDIYguy 7 лет назад

thanks buddy

@AlimKhan-xq7mc 5 лет назад

Air Field lighting system how to use CCR and MCR and check the transformer

@FranklinHicks-qs4gs 5 лет назад

Increase your vocabanizzle

@anhLe-hn3ig 17 дней назад

Best video to explain how to debug and repair a '09 - '13 Toyota Corolla alternator I have seen. Awesome dude! Thx Your English is excellent. I just replaced my '11 Corolla alternator, so I can attest the alternator used in this video. I wish I have the confidence to repair / rebuilt my own alternator rather than paying Autozone $305 after tax for a refurbished one in Jun '24.

@humanresource9659 2 года назад

I know I'm basically repeating what another reviewer said but it popped in my head before I read their comment so I'm about to say it now: This is the most comprehensive review of an alternator I have ever seen Keep'em coming

@robertculver3014 5 лет назад

Excellent. Does not waste time on simple actions. Goes deeper than many such sites.

@jielsonlancenicolas5411 6 лет назад

That was a clear explanation on what or how the the car alternator works. I appreciate this video so much!

@cheonglin1019 2 года назад

The is the best and most comprehensive video on alternator testings and diagnosis

@habsom1406 2 года назад

Superbly explained video. Clearly a very knowledgeable individual who knows his alternators and automotive electrics. Thank you for making, editing and uploading this reference quality tutorial. 😎👍

@Roudter Год назад

I like how you measure for voltage differences between the terminals and their endpoints - eliminating connection problems. It's a good method for any older vehicle.

@minaflores1018 5 лет назад

I just wanted to thank you for being so specific when explaining how to test and what to expect to see. This is the best video online. Trust me when I say I have watched and or read almost everything available online and not one comes close to being a thorough as you. I have been trying to figure out why my new alternator and new battery in my 2002 c320 still is not charging I found myself in an under information sh&% show. Thanks to you I have all the information needed, so that I can go back out to my car and have a good chance in figuring out my issue. Thank you so very much for your help. Keep up the amazing work. its really appreciated. :)

@JunkyDIYguy 5 лет назад

thanks mina

@Decimusblack88 9 месяцев назад

Did you figure it out?

@HamzahVerster 3 года назад

The most informative video I've ever seen on RU-vid 👌🏼 Well done mate. Please continue making videos like this. I wish you all the best and good luck 🙏🏼

@seanys 6 месяцев назад

This is the only alternator video I’ve found on YT that covered what I actually needed know. Well done and thank you.

@angelzlatanovski5215 6 лет назад

You are an awesome man. Explained everything. Thank you, thank you, thank you Sir!

@andreasdrz1084 6 лет назад

Information in detail, no bullshit... Really good, keep it up!

@rdyam 2 года назад

I've got a wide range of interests that I look up tutorials for and there's a very good chance this is the best I've ever seen - thanks!

@728b 4 года назад

Wow! That was quite replete. I honestly didn’t know there was that much to know about an alternator. I’m certain to watch this several times to absorb all the information. Thanks.

@nothinghere2067 5 лет назад

A genuinely thorough and helpful video! Thank you!

@johnnymorris55 3 года назад

An exceptional demonstration of automotive mechanical, electrical knowledge. Shared so others can learn and gain from your experience and hard work. I take my hat off to you friend. Well done.

@Norman92151 6 лет назад

Very well done mate.

@niopress5162 5 лет назад

really appreciate the time and effort you put into making this video.your method of explanation makes it so easy to understand every detail.thank you so much.

@hruaitea_elemel 4 года назад

this is such a well made video.. exactly what i was looking for.. thank you for making amazing content

@mikespain8655 4 года назад

This guy knows his stuff. Thanks, going to test voltage tomorrow on an old tractor with possible bad alternator.

@jessemerriman460 6 лет назад

Thank you for taking the time to put this together!

@ricardoandrade7925 6 лет назад

You explain really good! Thank you!

@mgirano5822 4 года назад

A great thank you from France. You are very fast speaking but I can understand with the subtitles. Your video is quite complete and it helps me much in my problem with my Honda FR-V.

@freestyleskyline 4 года назад

Amazing, clear, concise and informative. Love the video man!

@janicesmyth2183 5 лет назад

thank you for your great videos! I'm not a mechanic but learned quite a bit from your vids

@orleansadrianwhitakerarchb6422 5 лет назад

I HAVE TO SAY THIS HAS BEEN THE BEST CAR TUTORIAL I HAVE SEEN

@jacobvance429 6 лет назад

Your videos are very well done. Thank you for the detail.

@claybourne7162 3 года назад

Outstanding!! Thank you for taking the time to make this very detailed video!

@damienkubik1380 2 года назад

Fantastic video, thank you. Very informative and easy to follow. Well put together, and thought out. Videos like this is what make RU-vid great.

@verylittlehouseonwheels5892 10 месяцев назад

You did a good job man I'm just a guy that worked under a quad Master certified mechanic that love to teach. You hit on all of it. He made me a mechanic where most people want to be a mechanic. I never use a book only for torque specs now that I'm not a active mechanic tend to watch a RU-vid page for surprises that book won't tell you the surprise once in the job

@kareno8634 4 года назад

W0W! Talk about Testing to depths I never knew existed! Thanks! . . . _now > to test my brain for efficient 'holding power'_ = )

@maxxsmaxx1901 6 лет назад

very precise demo and lecture . Thanks !

@sherazkhan2120 3 года назад

Hats off to you my dude, your a beast by covering all angles! Much love

@mornebezuidenhout3003 2 года назад

Best video on alternator testing yet! Exactly the information other videos don't include. Thanks

@nia6849 4 года назад

Wow, best explanation ever straight to the point.

@kevinsmith8516 5 лет назад

Excellent video, thorough and easy to understand explanation!

@TAQEDAR 4 года назад

Thank you for your very helpful video. I know a lot about electric and electronics, but still I learned many things here about auto alternators. Thanks again!

@sakasmeed 3 года назад

Very good presentation! So much information requires regular reviews, but its all there. Thank you!!

@DonVTOL 5 лет назад

Best video on alternators I have seen yet!

@psuitt 5 лет назад

I totally agree! The Junky DIY guy explains alternators perfectly.

@royvilla5833 5 лет назад

Phillip Suitt I totally agree with you.

@TonyPablo 5 лет назад

Everything you need to know about automotive charging systems, great video!!

@joamon559 5 лет назад

Excellent video. Logically and clearly presented. Thank you very much.

@ClappaGlappa Год назад

Holy cow I learned so much! Excellent video! I never knew you could do individual component replacement of these but now I want to try some repairs on one I'm struggling with.

@marknaylor6550 5 лет назад

Very very good, best alternator class ive come across

@PJM454 5 лет назад

Best DIY video I've seen on RU-vid. Great job. Going to subscribe.

@rivrevvmedia 4 года назад

This is by far the best video on alternators I have seen! great job!

@SirHoppalot 4 года назад

One of the best DIY videos I've come across lately, nice job

@wrengouws3944 6 лет назад

Brilliantly laid out step by step explanations and visual points! My friend I have legitimately gone through hundreds of videos here on RU-vid and yours was by far thee best in this category! I'm going to be in here like swimwear and dive right into your other videos! Very well done mate!! And thank you for creating this channel!! 👌

@JunkyDIYguy 6 лет назад

Thank you very much

@lasurvivor47 6 лет назад

Very educational. Thank you. Great video.

@azmyin 11 месяцев назад

Sir, this was beyond GREAT! I followed the steps for checking a faulty alternator and found out that my friend's vehicle's alternator died due to running a 5+ year old battery

@luism.raposo5138 3 года назад

Wow! I'm a mechanic and you my friend are very good at this. Good job. I subscribed.

@Aneurysm06 5 лет назад

Mate, you're a legend, cheers

@swarfmonster3998 6 лет назад

Great presentation, very informative. 5 star!!!

@ninjaturtlegaming9890 3 года назад

Wow ! I cant express how much i like the video. I highly recommend this to EVERYONE !

@intestinalworm1202 3 года назад

This is a great video - well done! I used my multimeter to test an alternator out of the vehicle as per your video!

@Mr.Tiger.2013 4 года назад

646 dislikes jealous of this great video. Thanks for making it. One comment: I wouldn't want to risk putting the meter there while the car is starting, the surge voltage could damage it.

@mudassirnaseem6111 6 лет назад

very nicely explained. i would like to add couple of things plz excuse me. while checking the rotor & stators also check their ground resistance. i.e their should be very high resistance between slip rings & its shaft, also between stator & alternator's body. thanks

@s.mendez7160 Год назад

This was an excellent video, well produced and easy to comprehend. Thank you.

@richardnolan9562 4 года назад

Whoever narrated this did a way better job than the f****** school I went to dude you're awesome

@autopilotone4 6 лет назад

Thank you so much for an informative video. I have a parasitic drain and have pulled every single fuse in the car and it does not make any difference. Put a voltmeter switched to AC across the battery and wow, 29 Volts AC! That looks like a bad diode in the alternator!

@edgarsalinas6408 5 лет назад

good job , for sure one of the best videos outthere

@carlosberrios2638 4 года назад

Wao!!!!!!! This is like the most awesome video I have seen on youtube. The amount and quality of information it contains is invaluable. Thanks

@stevespeck3586 4 года назад

Great work. Thanks for taking the time to make such a clear, informative video.

@ajting3090 6 лет назад

You are a great teacher! Thank you. No hesitation here to subscribe. All the best to you!

@wbudd 6 лет назад

Wow, this was informative. Thank you and I'll be checking out your other videos! (:

@JunkyDIYguy 6 лет назад

ha haa thanks,

@69ztang 5 лет назад

Feels like I was in a mechanics class. Nice video and explanation.

@peterd.1165 9 месяцев назад

Your video is very professional and brilliant - I have a 1996 Volvo 940 fitted with a Denso alternator (100/14) - some time ago it started to make a whining noise. So far, I have replaced the bearings and drive belt - The Alternator is in outwardly good condition but the Whine persists. With the engine running, the whine is stopped when the large battery lead is disconnected from the alternator and resumes when the lead is reconnected. It has been suggested to me that the noise may be coming from the rectifier.

@jimnorrison8481 5 лет назад

I just became an expert on automotive batteries and alternators.

@24pionu 4 года назад

MzMa

@ratboysczurek2763 5 лет назад

Phenomenally informative video!

@DONphantasmo 2 года назад

this is one of the best alternator diagnosis videos on RU-vid. Thank you!!!

@JaceD4V1S88 6 месяцев назад

my alternator is on a 94 previa, recently the headlights, dash and dome light intermittently dim and brighten slowly like im flashing someone with my headlights but its very subtle but noticeable. been watching videos on how to replace some of this stuff myself as i cant buy a whole new alternator right now. very informative vid, thank you!

@johnswilley6764 4 года назад

Thank you Sir! Informative, succinct, articulate, and knowledgeable, also well produced video; without redundancy and unnecessary chatter. You are without a doubt among the best. I am now subscribed.

@CORZER0 3 года назад

Wow, I remember when your channel was only 24k subs! You're gettin pretty big, congrats!

@JunkyDIYguy 3 года назад

Thanks corzero

@ahmedalmidani2719 4 года назад

This is great learning video. Thank you for sharing the info.

@jeffs7267 4 года назад

EXCELLENT video, thank you!

@huanweili7699 5 лет назад

I learned more information on here than in my Automotive class. Lol 👍👍👍👍

@TRCVLOGPH 6 лет назад

great video🚗 thank you ☺☺☺

@toddlovec3938 3 года назад

Finally the best video that I can understand and covered it all thank you

@Davfon23 3 года назад

Absolutely worth watching. Thanks a lot. Keep the great work.

@QuanTruong7 7 лет назад

very informative as usual. almost 1k subs congrats in advance.. ;)

@JunkyDIYguy 7 лет назад

Thanks buddy,,,

@cesaralexisvalenciamontano7861 3 года назад

Almost 1k dubs 3 years ago? And now, almost 200k! Nuts!!

@mohabatkhanmalak1161 5 лет назад

Thumbs up, you are very good at what you do. In my teens, around 1980, I did an auto technician course at diploma level, which has come in very useful over the years. The modern vehicles of today are so much different, especially the electrics and electronic systems and require your kind of expertise. Keep up the good work!!

@economist633 2 года назад

Where did you do that corse?

@economist633 2 года назад

Course

@mohabatkhanmalak1161 2 года назад

@@economist633 It was a correspondence course at a polytechnic in the UK. I was living in Dubai at the time around 1980. Nowadays you can get these courses much easily on line, but look for good, proper institutions. Some can be bogus.