Aux Battery Delete - Need Help!

[jludave]

no danger of leaks or anything over the years?

No. Why would it leak? It's an AGM battery.

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[Dyolfknip74]

Hi Siddarth:

I take no issue with the quality of Odyssey Batteries, but do believe that when it comes time to replace a JL battery that owners should replace it with a group H7 battery (rather than a smaller H6) as per the following:

https://www.jlwranglerforums.com/forum/threads/main-battery-replacement-talk-jl-jt.100534/

Depending on how a JL is outfitted by the factory it may come with an H6 or H7 battery. But if you read the thread attached you will see how an H7 will fit regardless, and I believe, the increased cost, if any, justified by the increased power.

Good luck.

thread is gone......

 

[jludave]

thread is gone......

Works for me.

 

[Mguy]

No. Why would it leak? It's an AGM battery.

I'm generally OK about the relative safety of leaving an AGM in a Jeep after it is disconnected, but concerns:

1) Case Expansion. My experience is that after several years, at least AGM deep cyclers in heavy use, change shape and sides expand in different directions/rates. I'm thinking even an unused, discharged, or dead battery is still chemically alive.

2) Case Integrity. At extreme temps in both directions, how long will the case handle the chemical pressure? I haven't a clue for AGMs, but my recent experiences with some lithium power packs, even when not actively being used or charging, has been very "negative" when it comes to holding chemical solids in place.

 

[jludave]

but concerns

I'm going on 4 years with it in place doing nothing.

 

[Mguy]

I'm going on 4 years with it in place doing nothing.

It's not doing nothing - it's keeping your Jeep properly level and balanced as designed by the Aux Battery engineers who decided the best place for it was the bottom of the engine compartment.

My current aux is 1.5 years. Never used but charge maintained. It still holds to 12.6V after 3 months or so.

 

[AndySpill]

thread is gone......

Hey there:

Listen..try logging out of the forum and then clicking the link.

While signed on you may have been blocked from seeing this member's posts.

 

[Go Hogs!]

It's not doing nothing - it's keeping your Jeep properly level and balanced as designed by the Aux Battery engineers who decided the best place for it was the bottom of the engine compartment.

My current aux is 1.5 years. Never used but charge maintained. It still holds to 12.6V after 3 months or so.

so is the best play to take it out and just tape off the cables that connected to the aux?

 

[autotragic]

so is the best play to take it out and just tape off the cables that connected to the aux?

You can leave the aux battery in or remove it, it doesn't matter. You can remove the cables, leave them in whatever. The important parts are disconnecting it, pulling fuse 42 and making sure to keep ESS off in the future.

It's not "balancing" your Jeep either, I feel like it shouldn't need to be said but here we are.

 

[Criztaztrophe]

I just did this last month on my wifes 2018JLU. My Mopar battery was an H6 with 650cca. I put in an H7 with 850cca. I left the AUX battery in place. I disconnected its negative cable at the main battery’s attachment point. I taped it up well with electrical tape and moved it out of the way. I removed fuse 42 and called it a day. At some point I may remove/replace the AUX batter, using the passenger fender access point.

I don’t have a device for deactivating the ASS. I just told my wife to hit the button each time she starts it up, it’s her vehicle after all.

I have an 18 JLU as well. I just pulled the negative cable off, taped it up and pulled fuse 42. Lost back up camera and temp control. Put fuses 42 back in and regained bot

I just did this last month on my wifes 2018JLU. My Mopar battery was an H6 with 650cca. I put in an H7 with 850cca. I left the AUX battery in place. I disconnected its negative cable at the main battery’s attachment point. I taped it up well with electrical tape and moved it out of the way. I removed fuse 42 and called it a day. At some point I may remove/replace the AUX batter, using the passenger fender access point.

I don’t have a device for deactivating the ASS. I just told my wife to hit the button each time she starts it up, it’s her vehicle after all.

I have an 18 JLU Sahara. Pulled the aux negative, taped it up. Pulled 42. Lost temp control and back up camera. Replaced 42 regained both but now I have the A! light. Any assistance or ideas?

 

[autotragic]

I have an 18 JLU as well. I just pulled the negative cable off, taped it up and pulled fuse 42. Lost back up camera and temp control. Put fuses 42 back in and regained bot


I have an 18 JLU Sahara. Pulled the aux negative, taped it up. Pulled 42. Lost temp control and back up camera. Replaced 42 regained both but now I have the A! light. Any assistance or ideas?

Yeah you need to pull the fuse and you're going to have to go through a couple of power cycles and sleep cycles to get everything lined out that's normal.

When I did my aux disconnect I had the avenger A symbol lit up for quite some time actually but it eventually went away.

As I recall my ESS light was on for several months. I don't know why for most people it goes away fairly quickly or never even comes on but sometimes it just stays on for an extended period of time I'm not sure what the reasoning is but it's been known to happen.

 

[2018JLUsed]

No, sorry, I didn’t have any issues with mine.

 

[Criztaztrophe]

Yeah you need to pull the fuse and you're going to have to go through a couple of power cycles and sleep cycles to get everything lined out that's normal.

When I did my aux disconnect I had the avenger A symbol lit up for quite some time actually but it eventually went away.

As I recall my ESS light was on for several months. I don't know why for most people it goes away fairly quickly or never even comes on but sometimes it just stays on for an extended period of time I'm not sure what the reasoning is but it's been known to happen.

Thanks!

 

[AndySpill]

* If you pull Fuse 42 and the cable that connects the dual AGM battery's negative posts AND things get worse this suggests to me that your main battery may have actually been more "on the way out" than your Aux battery, which when connected was providing power that made up for main battery inadequacies.

* If you pull Fuse 42 and the cable that connects the dual AGM battery's negative posts AND then the ESS off light in the dash illuminates I'm inclined to think the same thing.

* With a strong main battery and these two steps (Fuse 42 and cable pull) you simply don't cause diagnostic problems with the vehicle. Pulling Fuse 42 silently prevents the Power Control Relay (PCR) from being energized, which prevents the two batteries from ever being separated, without the vehicle knowing this, and calls by the vehicle to either or both batteries (as in the pre-crank test of just the ESS/Aux battery or ESS events) go to all available batteries, of which you only have one connected: your main.

* If you pull the cable that connects the dual AGM battery's negative posts but you don't pull Fuse 42 expect the ESS off light in the dash to appear. The dual AGM JL's pre-crank test of the ESS/Aux battery, which was able to occur because the fuse wasn't pulled, and the PCR was energized, separating the batteries, found zero voltage on the ESS/Aux battery because you disconnected it. With no power found on the ESS/Aux battery, all but the earliest model 2018s turn the ESS off light on in the dash, and on second and subequent attempts crank only off the main battery. Only when the ESS/Aux battery is connected and has adequate voltage, or Fuse 42 is pulled and tricks the vehicle into thinking that it is testing the ESS/Aux battery will, on the next cold crank after the Fuse 42 pull, the ESS off light in the dash turn off. In these early 2018s, without TSB 18-092-19 flashed at the dealer, the vehicle won't crank.

 

[Somefun]

Guys tell me if this makes sens, The Mrs. Dropped off her 2021 rubicon and was installing a new interstate seven series battery. They said when they put the battery in they look for an auxiliary battery underneath the main battery in there is nothing there and fuse 42 had already been pulled out. Sounds strange to me. This was a brand new Jeep we bought off the lot. What do you guys think?

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