AUX Delete getting cancelled by accessory ground

[mwilk012]

Removing the wrong cable kills all power to the Jeep. OP stated he has power at the dash and power seat.

I would bet the OP removed the negative cable and let it touch ground through some other metal. Where is the unsecured ends of the negative, OP? If it touches the fender, it’s grounded.

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[THAW]

All current should flow through the IBS so it can be monitored.

Technically, the AUX (ESS) battery ground wire/path goes "over" the IBS, not through it. The IBS monitors only CR[an]]K battery current.

 

[Tr4ckD4ys]

Guys - I will take more pictures today morning to proof my point, but, I swear I super isolated the cable I took off. It’s fully wrapped in super-33+ electrical tape, and it is bend far away from any battery terminals, and it’s zip tied safely suspended in mid air. My vehicle is MY25, maybe something changed compared to before? My theories go more in the direction of:
- Did I really pull the right fuse (I think I did)?
- Could this be related to a host of accessories connected to the main and the ground points?

I swear I had power after disconnecting and fully isolating (as in, I tied them both up nicely in microfiber cloth, and then moved them away from the terminals) both battery terminal clamps.

 

[Badunit]

Technically, the AUX (ESS) battery ground wire/path goes "over" the IBS, not through it.

True. I missed that obvious fact somehow. That throws my first point out the window so there "could" be a separate body ground coming off the Aux battery. My wiring diagrams aren't showing one and no one in any of the "aux battery delete" threads mentioned one but that isn't proof there isn't one. I'm just gonna wait to hear how this turns out...

 

[Reinen]

There is also the option of actually removing the Aux battery, which will end up being dead weight anyway.

 

[Tr4ckD4ys]

There is also the option of actually removing the Aux battery, which will end up being dead weight anyway.

Yes my plan is to actually do just that. But this situation is so odd that I don’t just want to remove it before knowing what’s going on. Everybody has just been isolating the cable being held by the 13 nut and pulling F42. I feel like my case could yield important insight for MY24+ owners.

 

[Heimkehr]

I don't know if this will help, but here's the appearance of my ESS isolation effort in a 2021 JLU: the [mildly] thinner Negative cable disconnected and safely taped off, paired with the removal of Fuse F42. The larger Neg cable for the main battery, and the IBS module, remain in place.

The Interstate H7 AGM in the photo was installed in October 2024. 14 months later, there've not been any warning lights or charging issues that could be walked back to an incorrect effort on my part.

The only post-facto electrical connection is a small ring terminal just on the positive battery post, to provide power for the Quadratec 4-flat wiring harness. That's represented by the thin red wire exiting the protective terminal cover.

 

[azwjowner]

Yes my plan is to actually do just that. But this situation is so odd that I don’t just want to remove it before knowing what’s going on. Everybody has just been isolating the cable being held by the 13 nut and pulling F42. I feel like my case could yield important insight for MY24+ owners.

I wouldn’t say “everybody.” As I mentioned, on my 2022 the cable with the 13mm nut was the ground cable, and the cable with the 10mm nut was the aux battery negative, so opposite of what you did. I think an individualized examination of where the other ends go is in order.

 

[Tr4ckD4ys]

I wouldn’t say “everybody.” As I mentioned, on my 2022 the cable with the 13mm nut was the ground cable, and the cable with the 10mm nut was the aux battery negative, so opposite of what you did. I think an individualized examination of where the other ends go is in order.

Yes I’ll do that today still!

 

[Tr4ckD4ys]

I don't know if this will help, but here's the appearance of my ESS isolation effort in a 2021 JLU: the [mildly] thinner Negative cable disconnected and safely taped off, paired with the removal of Fuse F42. The larger Neg cable for the main battery, and the IBS module, remain in place.

The Interstate H7 AGM in the photo was installed in October 2024. 14 months later, there've not been any warning lights or charging issues that could be walked back to an incorrect effort on my part.

The only post-facto electrical connection is a small ring terminal just on the positive battery post, to provide power for the Quadratec 4-flat wiring harness. That's represented by the thin red wire exiting the protective terminal cover.

I will check again today and trace cables to see what’s going on.

 

[Badunit]

Everybody has just been isolating the cable being held by the 13 nut and pulling F42.

It used to be that way, then Jeep swapped the two wires. I don't know what model year the change was made and I have not heard that they swapped them back again (though they might have). I did my '23 a couple of weeks ago. I removed the one attached to the IBS and attached the "13mm nut" wire directly to the IBS. The IBS has a smaller stud, but whatever. And I removed F42.

 

[mwilk012]

Dang, all you did was pull the wrong cable then. That’s not nearly as fun.

 

[Tr4ckD4ys]

Yes - indeed you guys were right. It appears the cable held by the 13 nut that I isolated was not the negative cable from the aux battery. It was also clearly smaller in diameter than the one held by the IBS sensor and 10 nut.

I’ve now corrected this - and am still planning on removing the aux entirely.

indeed, not much of fun mystery at all, but, a mystery solved by the forum community!

 

[Badunit]

Still a mystery to me. The wire you had disconnected is supposed to be the only ground from the batteries to the body. Without it there is no complete circuit so there should be no power. It appears there is another ground somewhere. I can't think of another explanation.

 

[Tr4ckD4ys]

Still a mystery to me. The wire you had disconnected is supposed to be the only ground from the batteries to the body. Without it there is no complete circuit so there should be no power. It appears there is another ground somewhere. I can't think of another explanation.

Well then… yes. Maybe my amplifiers? They have a connection to the positive battery terminal and then to a chassis ground point in the back. Not sure how that would affect the aux though.

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