As soon as mine dies, that second battery is going to disappear! I've disabled the start-stop system already so I can't see any reason to be packing that silly motorcycle battery around.

 

Exactly...get it out of the mix.

 

Not sure how many are aware of this method to get at the Aux battery. You do not need to take apart the whole main battery, fuse box, electric hub or remove the tire and pull the fender and liner. I removed these two push pins

and folded the wheel well liner over so it was stuck on the top of tire....then laying on the ground next to the passenger tire...looking straight up into the engine bay you have access to the Aux battery compartment.

You need a 10mm socket to take the three bolts that holds the box in place. And a small 10mm wrench to disconnect the battery....I pulled mine in about 15 min.....that long because I had to slide out and find a smaller wrench for the battery...I put the wires and cover back in the box and reattached....no more Aux battery. I had already disconnected the negative wire from the main battery and pulled fuse #42.
You could reinstall one this way if you want. Pretty slick and only needed to remove two pins on the wheel well.

Yep,I peeked up there,I looks pretty easy.

 

The way the dual battery system works, when the auxiliary battery starts to go, it will drain the main battery.

When the time comes to replace the auxiliary battery, you should plan on replacing the main battery as well. Which makes this a bit of a moot point, no?

 

I decided to quit messing with it because I had 2 Aux batteries go in a year....so I just deleted that system and will just run the main battery.

 

So, wait, you can just take it out and not replace it? I don’t have my star/stop disabled. I just hit the avengers button each time I start the engine. How would that work without the aux battery?

 

There are a few methods to delete the aux battery. My plan is to remove the aux battery the connect it's pos terminal to the main and just tape up the aux's negative terminal. From what I've read that's the best way for my 2018 JL.

 

The 1st mod for every JL owner should be to remove disable the aux battery (unless you have an e-torque)according to personal testimony here.
Until your warranty expires.

I wonder if Stellantis knows how unpopular the 12v battery is?

 

You mean after your warranty expires. Disabling/Removing the battery while your vehicle is under warranty is asking for all sorts of trouble.

Stellantis doesn’t know squat. People are having battery issues left and right, and dealers continue mis-diagnosing the problem.

 

@daggo66 it is supposed to, according to some other threads I've read here and on other forums.

 

Why can’t you just disable it then put it back before a dealer visit?

My previous owner had an air intake installed for 13k miles before I owned it.

I returned it to stock but I have a crapload more in mods for them to get their patooties up in the air about.

 

Why can’t you just disable it then put it back before a dealer visit?

You could certainly do that. But, during the time that the aux battery is disconnected, you will need to make sure that it stays charged and fully functional. Kind of a PITA.

 

Good to know, thanks. But I do not have any 10mm sockets.

 

Ahhhhhh ...... The elusive 10mm socket ........ One day they will reemerge and take over toolboxes worldwide.

 

Not sure how many are aware of this method to get at the Aux battery. You do not need to take apart the whole main battery, fuse box, electric hub or remove the tire and pull the fender and liner. I removed these two push pins

and folded the wheel well liner over so it was stuck on the top of tire....then laying on the ground next to the passenger tire...looking straight up into the engine bay you have access to the Aux battery compartment.

You need a 10mm socket to take the three bolts that holds the box in place. And a small 10mm wrench to disconnect the battery....I pulled mine in about 15 min.....that long because I had to slide out and find a smaller wrench for the battery...I put the wires and cover back in the box and reattached....no more Aux battery. I had already disconnected the negative wire from the main battery and pulled fuse #42.
You could reinstall one this way if you want. Pretty slick and only needed to remove two pins on the wheel well.

Did you end up leaving the negative wire from the main battery? Have you had any issues with just running off the main?

 

Welcome to the Forum!
If you are going to perform the MOD, and eliminate the auxiliary Battery, then it would be a good idea to install a new main Battery. AGM H7.

 

On my 2020 my auxiliary battery just went dead. I removed fuse #42 and removed then used insulated electrical tape and tye-wrapped the auxiliary negative battery cable out of the way.
My scanner picked up no codes and drove over to dealer and had friend Scan Jeep, nothing shows up.
I do not use a Tazer, just remember after starting Jeep to turn off Start/Stop.


Sent from my iPhone using Tapatalk

 

On my 2020 my auxiliary battery just went dead. I removed fuse #42 and removed then used insulated electrical tape and tye-wrapped the auxiliary negative battery cable out of the way.
My scanner picked up no codes and drove over to dealer and had friend Scan Jeep, nothing shows up.
I do not use a Tazer, just remember after starting Jeep to turn off Start/Stop.


Sent from my iPhone using Tapatalk

Yes you are correct....if you do not push the button it will still function with the main battery. I have gotten jscan and will permanently turn off start stop with that.

 

I want to remove my aux, it's causing jeep to not start.
After removal, what do I do with the remaining wires? Stuff them somewhere?

 

I had the negative cable at main battery taped up and pushed out of the way. I removed the aux battery and left the cable in case I ever wanted to reinstall battery. There is no circuit created so they can just sit there....you can tape them all of if you want.

 

Positive to main battery and negative taped off and left in the box.Im only 99% sure on this one,so do more searching or somebody else may confirm.

 

I removed the #42 fuse and disconnected and tapes up the negative wire. Now my remote star doesn't work. Has anyone else experienced this?

 

Welcome to the Forum!
I have never heard any complaints when doing this. In fact, this has become pretty common practice.

 

Maybe I did something wrong, gonna try it again in the next couple of days.

 

Getting ready to try this method.

 

Welcome to the Forum!

 

FYI, the key is to replace your main battery when you do this "mod" if you're doing it as a result of a problem with the aux battery. Chances are VERY high that by the time you're notified that there is a problem with the AUX battery, it's already done damage to your main.

So, when (not if) you get an "ESS Unavailable" notification regarding charging, your 2 options IMO are: 1) Replace BOTH of the batteries with higher quality aftermarket batteries (O'Reilly Super Start is what I would use today), or 2) Isolate the aux battery by disconnecting the neg terminal from the main and insulating it, remove the F42 fuse, and replace JUST the main battery with a higher quality aftermarket battery.

Feel free to take it to the dealer for repair under warranty, but know that it is highly unlikely they will solve the issue, and you'll be back there soon. Even if they DO replace both batteries, they're going to put OEM Mopar batts in there.

If you're worried about the warranty, you should replace BOTH batteries with higher quality aftermarket units, and forego the "mod" to remove it from the system.

Also, removing and/or disabling the aux battery does not disable ESS, the above listed mod just takes a parasitic 12V source out of the equation. Your ESS will still work just as it was designed, it will just use your main battery instead of having the "extra capacity" of the aux battery.

IMO, if you isolate or disable the aux battery, and you take it to a dealer, it's highly likely they will not even notice unless that's part of what you took it in for.

 

So there is no reason to have to fish the aux positive cable up to the main positive?

 

I didn't, but I left the deceased aux battery physically in place. Removing the negative takes it out of the loop. If/when I remove the physical carcass of that POS, I'll probably move the + cable up to the main? If for nothing else, to keep it secure and not connected to something it's not supposed to be? IDK, will have a look whenever I finally start digging in down there.

 

With my 2020 Jeep Wrangler (3.0L diesel) all I had to do is remove fuse 42. Remove the main battery from the compartment (to include the plastic spacer that holds it in place and the felt around it) and wrap the cables with tape. I disconnected the main cable from the lug connector. I pushed them out of the way so they wouldn't keep creeping back. Under the battery there is a panel with 2 screws. Remove the screws and the panel connecting it. There's your Aux battery. Unscrew the cables and tape them like before for the main battery. You can pull the Aux cables out of the way as there's a groove they fit in. Don't forget to remove the lugs on the old Aux battery to use with the new one. Put the old felt around the Aux battery and put in in place. Reattach the cables. Replace the panel with the 2 screws. Replace the main battery with the lug connector on the + side. Bolt down the battery with the spacer. Replace the felt. Reattach the + and - cables to the main battery. Replace Fuse 42. You should have your Jeep back running. Cheers!