How to Replace the Aux Battery in your JL/JLU/JT the Easy Way!

How to replace the auxiliary battery on your 2018+ Jeep Wrangler JL/JLU or 2020+ Jeep Gladiator JT!
This process is fairly easy to do, tools you might need:
Jack & Jack stands (Wheel off method)
Appropriate wheel lug socket - Mine are aftermarket and 19mm (wheel off method)
10mm Socket and 4 inch extension with a ratchet
5/32in or 4mm 12pt socket- It has to be a 12 point.
#JTGladiator #auxbattery #JeepJLU
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[@Maxrotor1]

Great video. I was experiencing all type of electrical gremlins and light on the dash. They were all resolved after replacing the aux battery.

[@davidshettlesworth1442]

Thank you for an excellent educational video. I agree that coming via the wheel well is a better way than via above via the fuse box.

[@user-cf8ye7sd9u]

THANKS for posting this!!! WAY easier than going in from the top!!!

[@michaelsyoutubechannel5857]

Great tip. Some other videos demonstrate pulling off the entire fender to access the aux batter, but the less you have to remove the better.

[@shockerracing]

Awesome video! I’m saving this one for when I need to replace mine on the Gladdy.

[@adventurethirty]

Thanks! My factory one lasted 3 years so hopefully this one lasts another 3 😁

[@shapourshamss]

Thank you so much,because I couldn’t find out where is the second battery on my jeep gladiator Rubicon.hopefully I can change it myself.

[@hebertomartinez5253]

Great work, easy instructions

[@billymaples1]

Absolutely awesome video. I just finished my install and this video was a game changer. Probably took me 35 mins. Most of that time was gathering up tools and setting up a fan because it’s Hot outside. Nothing ever breaks down when it’s nice weather… 😂 Great Job again on the video. A+

[@adventurethirty]

I'm glad it was helpful!! 🤘

[@OurNewLand]

" Nothing ever breaks down when it’s nice weather." Man, that is the truth!

[@VNZMB]

Awesome. Thanks… this video helped me understand what was happening with my Gladiator.

[@adventurethirty]

Glad it helped you!!

[@tsatsostsatsos5592]

You are going to get girls hooked up in cars as well!! Bravo keep up the good work

[@adventurethirty]

I hope so! Thanks for the kind words!

[@projekt6_official]

Helpful with no extra nonsense crap. Thanks!

[@adventurethirty]

Hell yeah tried to keep it simple and just the relevant info!

[@jessren1618]

Just an fyi my spouse just replaced the auxiliary battery in my 2021 Jeep gladiator and you don’t have to take that fender around that wheel off. You can bend the edge on that wheel and go from underneath. He just finished up on my jeep and it’s working and cranking wonderful!🙌🏼

[@karinlb416]

totally going to try this! having issues with my ESS system now and not being able to start the jeep is getting annoying.

[@johnacosta1417]

Thank you!!!

[@albertchristensen7952]

I just had do mine today. Thank you for the video. I actually wasn’t able to turn my wheel and was able to get the battery out.

[@adventurethirty]

Yeah on that front I think it would depend on your tire size. I've heard of other people getting to it without taking their tires off after watching my video!

[@albertchristensen7952]

@@adventurethirty 35s wasn’t the best of circumstances but worked.

[@Verb130]

I removed my aux battery after removing all aft fender liner attachments and having my wheels at full driver side turning lock. I'm six foot and 200 lbs and had no issues getting into that area to remove the battery tray.

[@expatcanuck2087]

Kudos on the clear tutorial. And great nails, btw.

[@adventurethirty]

Thank you so much!

[@Kur1001]

just did my jeep and i think is better from the top

[@robdawg1017]

What about the auto start stop function working intermittently? Probably in indicator of a bad aux battery, right?

[@Diggin4LifeMetalDetecting]

Does the battery drop after you remove the 3 screws? When connecting the new battery up, do you have to support it while you reconnect the terminals? The video did not show how the process was completed.

[@VoodooCrab]

That seems a whole lot easier than taking all stuff off the top to get to it.

[@Zionist_Eternal]

Worked perfectly. Battery changed in minutes but warning light remains on. Is there a reset?

[@limakilo1331]

Well done!

[@TexasEdition281]

What did you use to remove the plastic clips?

[@FLSlaMrtn]

I replaced the aux battery on my jeep gladiator but the start/stop still says not available and also my check engine light is on and A! Any idea what's it could be

[@irvingpaez2159]

I changed my battery but still shows on dash battery charging do you know how long this takes ?

[@stanislawswiderski9974]

Can you charge the aux battery by itself?

[@77339futura]

Hi Val. Hey can you add to your parts list or let me know the battery you replaced it with and maybe the size of the one that came out? Like the H/W/D. Much appreciated, I would be able to get one before taking the old one out. Thanks

[@adventurethirty]

I was able to just go to my local parts store and they looked it up. I might still have the old one I removed lying around to look at though

[@mattfrediani7924]

Danger!! Shouldn't you disconnect the main Batt prior to removing the aug batt?

[@S_F_U_L]

First time watching so forgive me if you've covered this. Can you not access the battery via the hood or is it just easier this way due to the height of the vehicle? Can you tell me what the aux battery powers, I've only seen aux batteries for stereo systems before. So nice to see beautiful gals with kick ass hobbies and skills! Go you!

[@adventurethirty]

This is actually the easy way to get to that aux battery this way! You can get to it from the top side but it's under the main battery and fuse box so it's a bit of a trip to get to it!

[@77339futura]

The Aux battery controls the auto start stop system. You'll know it's bad when it no longer turns off at red lights. Also when it gets really bad it will throw a warning symbol on the dash that looks like an @ sign. It's a bitch getting to through the top.

[@adventurethirty]

@@77339futura thanks for elaborating on that! I have a Tazer and keep that auto start turned off

[@sunnydayincali]

Will the Start Stop Battery Charging sign on my dash go away once new Auxiliary Battery is installed ?

[@caharewatkins5447]

It should. They say it is controlled by the aux battery

[@deadonasunday]

2020 Wrangler JLU owners. There are actually three screws, not 2, holding up the aux battery compartment. Also the fender molding clips are not reusable. You must replace them.

[@adventurethirty]

If you're careful you can re-use them. I was able to re-use mine! But they're pretty cheap and easy to replace

[@edmondprice6215]

How do you know its your auxiliary battery that is having problems vs your regular battery

[@adventurethirty]

You'll notice issues with the auto start/stop, aux buttons and other functions that are kinda secondary. A main battery might not show signs of trouble unless you're noting low voltage on the gage (that you have to dig for) or it goes dead completely. If you ignore the aux for too long it does eventually take out the main battery.

[@MichaelHardy-nv6tt]

What about on the 2.0? Same location?

[@adventurethirty]

Not sure. I've never worked on a 2.0 version. It might be though!

[@drue6360]

Are y’all in Missoula?

[@adventurethirty]

I went to college in Bozeman and used to live in that area but were in North Dakota now!

[@rmjryost]

What's the pup's name?

[@darthlestrange]

The clips can’t just be taken off you actually do have to break them so idk if this is actually a better way to remove the battery.

[@adamwillis908]

It's not actually necessary to pull the fender liner, doing so would probably make the battery more accessible and the install more comfortable but I pulled the fender liner back and crawled up inside the wheel well to do mine, didn't even have to pull the wheel (although ymmv there). Was I half blind while doing the install? Yeah, kind of, but i really wasnt in a position to be breaking body clips/pins. Just one less thing to fix.

[@MrJahsoul1]

Yes, absolutely no need to remove your wheel. Peel back fender liner, full lock wheel. I was done in 25 minutes.

[@adventurethirty]

Oh yeah no need if you can squeeze! I needed to rotate tires so mine were off anyways. But a friend of mine did it by just steering to lockout to give her some room

[@veraciouspatriot4297]

I’m betting with the aux battery being so close the the passenger header/catalytic converter, the heat doesn’t help the battery life.

[@adventurethirty]

You might be onto something with that theory

[@teon39]

Why not just delete it while you have it removed?

[@CurmudgeonExtraordinaire]

You forgot the part about cussing the braindead kiddie engineers at Jeep who designed the stupid ASS (Auto-Stop-Start) system that resulted in them putting that battery in the vehicle in the first place plus their compounded idiocy of putting the battery in such a ridiculous place. And you might as well start out by buying some more of those clips because some of them are going to get lost / broken every time you remove them. The way the kiddie engineers designed the dual battery system on the Jeep was such that you had twice the failure points and none of the benefits of a true dual battery system.

[@danielsmith5351]

If you remove the aux battery then take the positive from the aux battery and connect to the positive of the main battery then tie the ground from the aux out of the way you wont need the aux anymore. I removed mine 4 years ago.

[@adventurethirty]

I've heard of that delete before. Any issues with it since then?

[@danielsmith5351]

None. The Jeep only needs one battery. I run extra lights, winch,etc. But I never run the stop start system . But the stop start system will still work on a 2018 Wrangler but you would run the risk of killing the main battery while waiting in long traffic stops or when sitting for extended periods in traffic just turn off the stop start or unplug the stop start and never worry about it. The aux battery doesnt start the vehicle the main battery does. The aux battery only runs the accessories while the vehicle is in that mode.@@adventurethirty

[@jlautomotive6349]

@@danielsmith5351I have a 2020 Gladiator and my remote start does not work… (bought it like that 3 months ago with 52K miles) When I press the button on the remote I get nothing… no lights, no horn… nothing. Could this be the AUX battery? And could I do the AUX delete, I never use the start/stop… it’s the first thing I do after I start my truck… lol

[@danielsmith5351]

@@jlautomotive6349 It shouldnt have anything to do with the aux battery because the system is still connected to the main. Its usually a faulty key fob. Do you have two key fobs and if so does neither work? Do you have to touch the fob to the start button on youre dash to start the vehicle? If you have some mechanical skills you can remove the aux battery. But there are videos out there that show step by step how to unhook certain switches or plugs to disable the start stop. Get back to me on the questions and ill try to help you figure out the problem with the remote start. Its a process of elimination with this sort of thing.

[@jlautomotive6349]

@@danielsmith5351 Thank you for replying… I can start the Jeep with the key in my pocket… when I bought it it only came with one key (no bag for the freedom panel or tool kit) I did just buy a new battery for it that I’m going to install today to see if that changes anything… but I get the message for the start/stop after starting and for regularly I’ve been getting the A with the arrow after I start… So I’d like to just delete the AUX battery as I never use the start/stop I always shut it off as soon as I get in the Jeep… I live in NH so I would like my remote start to work for the winter….🤞