******NOTE!! - This will NOT disable ESS. It only takes the AUX battery offline, so if and when it fails, it won't drain your main battery.
The auxiliary battery in the Jeep Wrangler and Gladiator can be problematic. The battery is there to keep electronics stable while the Jeep is in an ESS (Electronic Start Stop) event.
The problem is that the small battery can begin to fail, and it will continuously pull from the main battery, trying to recharge.
This can leave you stranded and unable to start your vehicle.
ESS doesn't save fuel in any appreciable way, but it can reduce emissions slightly in city driving.
While Tazer and other devices can disable ESS, they cannot disconnect the two batteries from each other, so the risk of one battery purging the other is still there.
This method physically takes the AUX battery out of the equation, but leaves it in the vehicle. If you want to completely remove the battery there are videos on doing that, but this is the quick and easy method.
Jeep inexplicably changed the ground cable configurations in 2021 around mid year, so depending on which side of that change your vehicle was built, it could be the larger cable or it could be the smaller one.
If you remove one and there's no power, simply swap them.
If you're running the two battery setup in the factory configuration, and your Jeep is difficult to start, or it gives you a myriad of errors on the display, then you're experiencing a battery failure.
in that case, it's a good idea to perform this process before charging the main battery or jumping it and letting it recharge while driving. That's because if you don't separate them, the AUX battery will continue to drain your starting battery.
When you disconnect all power the onboard systems have to reset. So don't be alarmed if something's not working on U Connect immediately. Subscriptions like Off Road Pages, Satellite Radio, and others may not be available until some 24 hours later.
The ESS will not and cannot function with this setup. The button will still illuminate if pressed, but it was already not going to work.
You will see no errors on the display regarding ESS.
