Bill_P
Well-Known Member
I deleted the aux on my '18 JLUS well over a year ago and haven't had as much as a hiccup out of it. Gave that one to my wife when I got my '23 and she hasn't mentioned any issues either.
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Aux battery issue, need second opinion
- Thread starter WhitneyWillys
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- aux battery ess
Riverjeep
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Just my personal 2 cents worth but on my last two Jeeps I would get just under 3 years on my batteries before they were shot. Sounds like you are at that point so I suspect you need new batteries.
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WhitneyWillys
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- #33
Question. The flat L shaped terminal is the Aux negative. Correct? That needs to get isolated. Looks like I have to get the 10mm nut on the right out, and mount the left side terminal directly on top of the battery sensor and put the 10mm back on. Correct? BTW it is really hard to get the left nut (the post one) out. Too tight.
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WhitneyWillys
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Ok. Got the nut/connector out. Disconnected the Aux -ve. Taped it up well. Left the F42 in place. Tested the main battery at O'Reilly's. It failed. Replaced main battery with a H7/R94. Everything is looking fine now.
At the end of it all, I am now driving around with the ESS alarm still on, but there are no other symptoms of a weak Aux. My Aux switches unavailable warning is gone. ESS won't kick in on the main battery, so I don't have to remember to turn it off, or don't have to invest in a Taxer like solution right away either.
Will update in a day or two how it all fairs. Thanks all.
At the end of it all, I am now driving around with the ESS alarm still on, but there are no other symptoms of a weak Aux. My Aux switches unavailable warning is gone. ESS won't kick in on the main battery, so I don't have to remember to turn it off, or don't have to invest in a Taxer like solution right away either.
Will update in a day or two how it all fairs. Thanks all.
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WhitneyWillys
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- #35
The real reason I bypassed the dying Aux battery is because I don't want to get in to main battery problems. I did not want the Aux weakening the main and putting me at risk of getting stranded. I also wanted to eliminate the delay in getting my Aux switches working.
The reason I left the F42 in is because the ESS alarm does not bother me as much as the problems removing F42 could have *potentially* caused.
My understanding is removing F42 puts the burden on me to ensure I turn of ESS, if not Everytime I drive, at least more often than not. Else I once again get into the situation where I am weakening my main battery and accelerating its demise. That will once again, I assume, create the problems that having the dying Aux battery connected to the main are causing me right now.
Do you concur?
The reason I left the F42 in is because the ESS alarm does not bother me as much as the problems removing F42 could have *potentially* caused.
My understanding is removing F42 puts the burden on me to ensure I turn of ESS, if not Everytime I drive, at least more often than not. Else I once again get into the situation where I am weakening my main battery and accelerating its demise. That will once again, I assume, create the problems that having the dying Aux battery connected to the main are causing me right now.
Do you concur?
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SoK66
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Were it me, I'd pull the fuse, remove and isolate both the AUX ground and positive cables at the main battery, then remove the AUX battery completely.
Willys41
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I agree
by only doing half the AUX battery delete is just going to complicate the issue
Hundreds of people are running with the AUX battery deleted and I have not heard any negative comments only good comments
by only doing half the AUX battery delete is just going to complicate the issue
Hundreds of people are running with the AUX battery deleted and I have not heard any negative comments only good comments
Upnarms
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So was it the cable with the L connector?
Question. The flat L shaped terminal is the Aux negative. Correct? That needs to get isolated. Looks like I have to get the 10mm nut on the right out, and mount the left side terminal directly on top of the battery sensor and put the 10mm back on. Correct? BTW it is really hard to get the left nut (the post one) out. Too tight.
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WhitneyWillys
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- #39
Yes, that was the one that led to the AUX battery.
AndySpill
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@Upnarms I'm glad that Sam @WhitneyWillys found the correct cable,but in light of this post https://www.jlwranglerforums.com/forum/threads/ess-battery-cable-change.86624/ that reports on how Stellantis swapped the two factory cables on the main battery's negative post--one of those cables leading to the body ground and the other to the negative terminal of the Aux battery--I think it always prudent to start at the vehicle's body ground and follow that cable to the negative terminal of the main battery, regardless of what model year JL you have.
Once identified, that's the cable you leave connected to the main battery's negative terminal. It's the other one from the factory, which leads to the Aux battery's negative terminal, that in this exercise gets removed and has its metal end tapped up.
Once identified, that's the cable you leave connected to the main battery's negative terminal. It's the other one from the factory, which leads to the Aux battery's negative terminal, that in this exercise gets removed and has its metal end tapped up.
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zouch
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better question might be; Why didn’t they put the Aux Batt in an easily accessible compartment on all models like they did for the EcoDiesels?
on the Diesel, you just lift the main batt out and there’s an access door directly to the Aux batt. super simple.
on the Diesel, you just lift the main batt out and there’s an access door directly to the Aux batt. super simple.
JLRyder
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The aux batt is super simple to replace if you just remove the fender. Took 10 minutes. Just buy a pack of clips and rock. I’ll own the unpopular opinion here and say leave it alone, it’s in there for a reason and you will be one ecu flash away from new headache.
Willys41
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NO headache. DELETE IT
A new AUX battery if you are lucky will last 2 years. After 2 years you will see it slowly degrade
My replaced AUX battery in my 2018 Rubicon only lasted 2 years and when it faild it fried my 8.4 radio. $750 for a used radio
I ant going to go though that again
Both my 2020 Willys and 2018 Rubicon no longer have an AUX battery in the system
A new AUX battery if you are lucky will last 2 years. After 2 years you will see it slowly degrade
My replaced AUX battery in my 2018 Rubicon only lasted 2 years and when it faild it fried my 8.4 radio. $750 for a used radio
I ant going to go though that again
Both my 2020 Willys and 2018 Rubicon no longer have an AUX battery in the system
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