Bypass Jeep Wrangler and Gladiator Aux Battery the Easy Way 

Ran into this same issue while playing in Colorado. I pulled the neg cable, pulled the fuse and no more issues. After we got back, i pulled the passenger tire an wheel well cover and removed the battery completely, also taped up all the cables. No issues since then and it been 5 months.

Great video. Informative, quick and to the point. Not like these other fools who make a 50 min video on how to add windshield fluid. Thank you brotha.

Add me to the club. I replaced my aux battery last weekend and the new one must have not been fully charged because both batteries were dead when I went to start it 6 days later. I couldn't even jump start it. I also tried jump starting it using the first post under fuse box, which supposedly jump starts the aux battery, but the engine sputtered and died as soon as I removed the jump start cables. So thanks to this video, I removed FUSE 42 and the negative aux cable and it worked like a charm. It jump started right up and kept running after removing jump start cables. It appears the main battery is now able to recharge as it restarted after running for only a few minutes. This video was a lifesaver. Thank you for posting and for the helpful comments below.

Just did it last weekend. Saved money again.

So I decided to give it a shot, got a 2018 JLU and like everyone else was saying it's the other cable that needed to be removed. So I tried that at first, started the Jeep, and light and warning still came on. So I disconnected the other cable and tried it, but got nothing at all, reconnected the first one and low and behold the warning light doesn't come on now! Thank you!

2018 Jeep Wrangler Unlimited Sport V6 Followed the steps and no more A-light! Only issue I ran into was my terminal cables were switched compared to your video, but I just had to swap the terminal cables around and it worked out just fine. Thank you so much for a great video!

Great Video 👍 Great Info 👍 Straight to the point. I'm doing this today !!

Wow! You are the man! I’m having the exact same issue, with my 2020 Jeep Gladiator Rubicon (37000 mi). I Just replaced my main battery yesterday ($275) and then noticed the A with the circle and exclamation point! I’m going to try this, first thing tomorrow morning! Bye F 42! Aloha!

Awesome vid and instructions! We hate stop/start for various reasons everyone else does, and as soon as I get home this will be done! Thanks OTR

Woooohooooo! Thank you so much! 😆🙏🏼The answer to my headache! Currently having, this exact issue, with my 2020 Jeep Gladiator Rubicon (37000 mi) I already, installed a new main battery yesterday ($275) and having the A with the circle and exclamation point 😢notification! I’m doing this , first thing , tomorrow morning! 🥳🙌🏼💟you are the man! 🐶🤙🏽 bye 👋🏼 F42!😂🤣

108*? Wow. That’s crazy. Great video. Thank you.

Best video! No windbags just talking!!!

The Auto Start/Stop dash light came on in my 2022 JL with under 10,000 miles. This simple workaround handled it perfectly!

It worked on my 2020 JL! That said, it was with the end that you taped not the one that was reconnected back to the battery. Thanks OTR Overland.

Best Explanation yet. My Rubicon has only one battery with the 2.0 Turbo.

Thank you for the information and the video. I am now encountering similar problems with my 2019 Jeep Wrangler Sport. I will be trying this sometime today or tomorrow.

My experience: Got in, attempted to start my 2021 JT Mojave, it would not start, nor turnover, no clicking, just some extra dash lights (check engine, and collision avoidance - associated with ACC system). Problem was a dead (10.5V) battery, and the blessing was that it was in my driveway & I wasn't stranded somewhere less safe, thanks to my wife's car as a backup. And, as with any unknown mechanical or "how to" issue, I came to RU-vid. What did we ever do before YT? LOL! So, apparently my AUX battery died, and eventually my main battery was taken down by the AUX. No warning. I hadn't turned on my Start/Stop switch lately, and that would've been a clue if I had noticed it not working. The batteries would've been covered by the 3/36 warranty, but I was at 37K when they died. How convenient, Mopar! So, I pulled the F42 fuse, tied off the same ground cable as illustrated in this video, installed a new main battery, and everything is back to normal, except I no longer have an operational ESS system. I'll eventually yank out the dead AUX battery, but good to go for now. Thanks!

Thank you for helping me out. This is Thomas

Thank you. Enjoy your videos.

Thanks for de vid. Mine is a 2020 jl and I had ti connect the other cable and tape up the one without the terminal screw.

Great, easy to follow DIY that will come in handy for most Jeep Wrangler owners. THANKS!!! but, sheesh! 108º?!!! A bit warm, eh?

I have a 2019 Wrangler Rubicon with the original aux battery. Yeah, it's long-in -the-tooth and is having issues. The process of replacing it shows how poorly FCA put thought on location for easier access. I'm going to try to bypass that battery per your instructions. Otherwise, it's going to be a chore either removing the fender guard or going-in from the engine compartment (and tearing apart the fuse box). Either option... I don't look forward too. Thanks for your handy hack!!!

I feel your pain... good video

I just disconnected the wiring harness on the switch under the hood. Put electrical tape over light on dash.

Thank you so much

Good video . At a Jeep dealership, it does VOID any warranty.

21 and newer the aux cable is the one with the tab, and extra post, that you ended up taking off. Prior years it was the easier, first one, you removed. Either way it should be the smaller of the two although I find it hard to tell. I just did this today on my 21 JLU.

Thanks. Good vid

damn I wish I had mileage :) Thanks for this video!

Thanks for sharing.

I did it last evening & there is no error sign on my speedometer for auxiliary battery. Thank you But the msg comes up, auxiliaries not working battery charging, is it ok?

It works nice with a stick. Pull up to a light in neutral, let out the clutch. When you are ready to go press the clutch, shift into gear and go.

Wish I had watched yours first.

Great video, thank you. Curious what year is your Gladiator? I have a 2020, unsure which negative to tape off.

Got a 2019 JL and the A sign appear like one month ago but yesterday my main battery was dead and I charged it and I did this but I didn’t function so I connected the other cable the one you tape up and it started but my amp it’s at 13.8

So, after watching this, I decoded to do the same to my 2021 Mohave. 1) Pulled F42 fuse and 2) removed the ground as you have done. The auto stop-start is now disabled, however, I still get the warning that the auto stop-start function is not working and then get the yellow A. I saw where some have said to remove a plug that connects to the ground. That made no difference either. I've watched this and another similar video multiple times to see if I am missing something. Checked and rechecked that I pulled the correct fuse.

I did it last evening & there is no error sign on my speedometer for auxiliary battery. Thank you But the msg comes up, auxiliaries not working battery charging, is it ok? 4:34

Thanks for the great video! I always punch the A button on the dash to disable the start/stop. If I remove the fuse and bypass the battery without using a a taser or other bypass module, what will happen? My guess is the start/stop won’t click on at idle and I won’t need to press the button to disable it? I’m just concerned that it will cause some other electrical issue in the jeep. Thanks!

I have 21, tried as shown didn't work. Watched again tried reversing grounds, nothing , wouldn't start, like dead battery. Tried again connecting plain end cable, WORKED!, Will tape up cable with stud, and cross fingers it will continue to work.

I did this today and replaced the main battery as it tested bad also. I pulled fuse 42 and Jeep started right up, but my A/C went crazy. If would only blow hot air and I could not change the temperature settings. I replaced the fuse and everything worked, but the error icon came back on for auto-start.

On my 2020 gladiator it's the other terminal not the one you taped up, for some reason.

Did you make any adjustments to fit the larger lug hole over the smaller bolt where the aux ground had been?

Thank you for the video, however I have the light on and I remove the fuse 42 and disconnected the terminal and the light still on I need help!!!

A silly question, but what is the auxiliary battery negative cable bc I ‘ve seen other videos where people disconnect a different from yours?

can this be done without the taser? my batteries just died after ESS having issues, so I'm hoping I can just pull out f42 and re-attach those black cables? Then replace main battery and be good to go?

have a 2018 jl wrangler.did exactly like in this video.but had no power when i did it

if you leave the positive cable connected to the aux battery can it still draw your main battery down?

How do I know which of the 2 negstives I have to disconnect, in other videos it mentions that it is the other cable, mine is a 2020 sport s

just did it, it works with the other cable not the one you used. woking fine no error sign till now thanks.

The ESS still happens, so remember to push the ESS OFF button before driving.

If you have to go back to the dealer and connect it back..would the chances be high that the aux battery is dead?

Hey man..I have a problem with my 20 jeep wrangler jl that it will crank for like a minute but it won't start..I replaced both batteries about 3 weeks ago and yesterday let me stranded at a busy intersection..I towed it back home and is still cranking but not starting..it only has 30000 miles on it ...any suggestions will be greatly appreciated..thanks for all your help

Mine is 2018 JL. Pulled the fuse and battery cable. The dash light is still lit. did I pull the wrong cable?

For some reason my jeep wouldn’t start after doing this. When I put the fuse back in and then put the aux battery back on everything worked… like the auto stop/start resumed working and hadn’t for about a month

Would that work on a 2018 JL? I had to replace my aux battery like 2 years ago. It's starting to tell me my something or other is shut down and the battery is charging.

So after all would the start stop function work again or that is gonna deactivate it ?

I just did this and the auto start/stop message still comes on, along with the A on the dash. Any suggestions? 2018 Sport. I noticed someone mentioned they had to switch the black terminal and use the other one than you did in the video. I tried this but the lights are still on.

If you by pass the aux battery do you lose the remote start??TIA

So I did this and the start stop is still active. Does this just bypass the aux battery to save my main battery? But I still have to push the button every time I start the car. Or should this just turn off the start stop feature all together? I have a 2022 gladiator rubicon.

I have a 2020 Jeep Wrangler Sport. I tried your fix and it just plain don't work. I've switched the both cables and I know I've disconnected the right one and I know I pulled the right fuse and it still don't work. Too bad because it sounds like a great fix and there are probably 10 more RU-vid videos describing the same one

I take the fuse f42 out, and the black cable still has the light on the dashboard

Hi, thank you for the video I took out the 42 fuse and I disconnected the correct wire from the battery but I’m still getting the warning light on the dashboard. Any thoughts? Thank you.

I did exactly what you did and then every time I went to start the truck the first button press it just clunked and I had to press it again a second time to get it to start. Eventually my truck wouldn't start even with a brand new battery.

What would happen if I just take out the fuse and leave the battery connected

Do you think this would work on a ‘18 compass?

Does anyone know what is all connected to the aux battery?

Would using a OBD and turning off the auto start stop work that way?

I have the Taser mini installed on my 21 Rubicon. I just replaced both batteries and now I have the service start stop message. Any ideas why. Thanks in Advance.

So I did that exact same thing and my jeep still shuts off at the stop lights and restarts?

Why do you have to remove the neg wire? The aux battery only has two wires. Pulling one removes it from the circuit.

So this worked for me. The light went away and everything seemed to work fine and then a couple days later the error message came back on. How is that even possible? Does it matter? I'm so confused now

I noticed that the ambient temperature went from 86 (before) to 108 (after). How did that happen?

Do you need larger main battery or is the factory battery ok? Have a 2019 JL. Had the aux battery go bad and drain main once before but it will still under warranty so dealer replaced both. Now aux seems to be failing again so looking at this delete method. Just want to make sure we don’t need to replace main. Thanks.

OK so this is weird. I had the same issue on my gladiator. Pulled the F42 fuse and took off the negative cable post. What is strange is that in your video the terminal with the long post was taped up and put aside. I followed your video exactly and got NO power to my truck. I tried swapping the other cable and I have power and no indicator light.

108 Degrees!!!! Just a word of caution, that Aux Battery is a Lithium and it will degrade over time. If it gets too low on voltage it will become damaged and could start swelling as the lithium breaks down. I fly FPV Quads and battery management of Lithium Batteries is a PITA....well my drone batteries are LiPo...maybe the Lithium Car batteries are not as prone to this issue?

any long term effects?

Just tried this and had no power. I️ did put everything back the way it was but did leave the fuse out. Now the light is gone but wondering if that’s okay?

Will the stop start still work even if the fuse is pulled and the negative cable is removed

So I did that. And the car doesn’t turn on at all.

I completed the process and the auto stop error light is now gone.....Good news. Now I am having a strange issue with the climate control. The Auto feature on the climate control does not function properly. Any ideas?

My wrangler jL the ground wire is on the side

108F....Dude, that's insanely hot lol

I try to do the same thing on my 2020 jl but the jeep doesn't have a power if i disconnect the wire 🤔🤔🤔

Still under factory warranty right? Why not just take it to the dealership for a free fix?

What is the point for the auto stop start system.What is the point in having it any way

what happens to the ESS functionality after this ?

I unhooked everything but when I go connect just the main it doesn’t turn on at all please advice

I have a 2021 gladiator. Did not work. Warning light still came on.

Sadly this did not fix the problem plus in my Rubicon it impacts other features. So I am just going to replace the battery. The Tazer takes care of turning off the start stop. Thanks for the video though.

Actually...if your main battery is still healthy, the stop start system will still activate.

Don’t know why, but my check engine came on ?

With a manual transmission, stupid ASS (Auto-Start-Stop) system is easy enough to avoid... In addition to all the other conditions that the automatics have, you also need to be stopped, have the transmission in neutral, and the clutch released...

I have an e-torque JLU Willys '21, 3.6l, gas, so there is no AUX battery on this model... Would the fuse pull still work as simple as you showed and if so, what was the need for the aftermarket industry to develop those electronics Stop/Start disablers?

May sound like a dumb question but, its the same with the 2.0 turbo engine as well?

I did it last evening & there is no error sign on my speedometer for auxiliary battery. Thank you But the msg comes up, auxiliaries not working battery charging, is it ok?

I did it last evening & there is no error sign on my speedometer for auxiliary battery. Thank you But the msg comes up, auxiliaries not working battery charging, is it ok?