Totally dead, nothing, no power

[GATORB8]

Sounds like you may already have the pressing issued figured out, but wanted to throw an idea out there. Do you have a multi bank 12v setup in one of the RVs? Could swap the Jeep primary for a secondary battery on the RV and charge it with the RV’s alternator.

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[FirstF80InSpace]

the battery in the fender well is an Aux, I’m sure you’ll need to have your aux and main battery warrantied (or replace both) if it won’t start off a jumpstart a good known attempt (not the way it shows in your profile picture with two jumpstart packs connected to it. If it doesn’t start and comes down to battery being bad the aux 9/10 will also be done for. Not an uncommon problem with the JLs

I thought the 4XE did not have an aux battery. It doesn’t have ESS so why would there be an aux battery?

 

[michail]

I thought the 4XE did not have an aux battery. It doesn’t have ESS so why would there be an aux battery?

It doesn't. The HVB takes place of the aux.

If the 12V battery is dead, the contact switches to the HVB can't open.

The DC to DC converter also doesn't supply constant 12V power. So if the main battery is bad you would have the same problems any Wrangler would with a bad battery.

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