Strike Four, You're OUT

[Chupacabra]

It isn’t 1960, no one should have to babysit a battery just because the vehicle sits for a few weeks. Utter bullshit.

Or a few days. Even if I top mine off with the NOCO, a few days sitting in the garage and ESS quits working again right away.

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[MK212MX]

So easily fixed. To bad you just didn't bylass the aux battery (like most of us have). Took me five minutes, and I'm not that handy.

You obviously didn't read everything. He stated if he did the fuse delete the dealer told him it would void is current and extended warranty. He took it to the dealer for a fix not an open appt to keep coming back for a new battery.

 

[MK212MX]

Come on, don't even get into the reliability between a Tacoma and a Jeep. That is a losing battle for you. Yes I have both.

 

[MK212MX]

OP, battery issues are a super common issue with these Jeeps but, there are countless threads on battery issues and solutions on the forum, it’s too bad you didn’t reach out. Good Jeep dealers/mechanics are a needle in a haystack.

Sorry It didn’t work out. If I have any parting advice, it would be to learn how to work on as many technical aspects of your next vehicle yourself. You’ll save yourself money, time and you’ll know exactly what was done and in what quality. Best thing I ever learned was how to work on Jeeps when I was young. Luckily, even YouTube is filled with tutorials now.

Again he was told any home grown fixes would void the current and extended warranties he paid for. So why would he try and remedy it himself. Jeep should be able to fix it.

 

[SparkleTooth]

Too many folks on here with Stockholm syndrome. The charging system is abysmal on the JL line and work arounds just don’t cut it. Jeep needs to address it and should be a simple solution. Sadly mastering the 12 volt charging system is too complex for them. It’s a shame that such a simple thing makes owning a Jeep a terrible experience knowing you will eventually be left stranded one day unless you replace your batteries every 3 weeks.

 

[Mguy]

For those interested, my coincidently recent post, in another thread, on maintaining JL starting reliability after doing the easily reversible aux negative/F42 disconnect:

I'm less interested in the "why" behind the stock JL electrical system. Here are some of my observations on "what" can be done, with "parasitic" loads being part of the overall problem.

My new AGM Mopar aux battery, provided under warranty, has a fully charged resting voltage of 12.8 plus. After 3 months, in a relatively cold environment, it self-discharges (no parasitic loads) to 12.6 volts. My 3.6L engine turns over with that 12.6V aux battery alone, with no problems, in 20F to 40F temperature. The aux battery remains in my Jeep as a backup.

My 30 month old Mopar main battery (another warranty replacement), not bothered by the aux battery after the negative/F42 disconnect and prevention of ESS charging shut-off, recently passed a load test. Fully charged and then siting in sub-zero temperatures and feeling typical parasitic loads for a week, the engine started with no issues. It was -14F. This same main battery, when about 15 months old and fully charged in a relatively warm environment, sat for 2 months suffering parasitic loads, and then started the engine with no problem. It should go another 30 months.

There are a few obvious conclusions. The aux negative/F42 disconnect creates a more reliable single battery system adequate for typically driven JLs. A healthy aux battery provides a good backup for starting (at least for gas engines). Preventing ESS charging shut-off is good for single main battery performance. Also, regardless of whether Mopar batteries are of "lower" quality than those touted elsewhere in this forum, they are not "low" quality.

 

[Punkn89]

Again he was told any home grown fixes would void the current and extended warranties he paid for. So why would he try and remedy it himself. Jeep should be able to fix it.

Jeep should be able to fix it, agreed. But, if they can't, do you just roll over and give up? Up to you. I wouldn't.

 

[rcadden]

Did anyone ever check the charging system and grounds?

This was my thought reading the OP. Constant swapping of the batteries but no mention of checking the overall system. Lots of points between the two batteries that could have been causing issues.

 

[rohdawg]

unless you replace your batteries every 3 weeks.

Is that how you do it?

 

[Vinman]

My 2019 wrangler built late 2018 still on BOTH original batteries. Did the ESS bypass when new.

Too many folks on here with Stockholm syndrome. The charging system is abysmal on the JL line and work arounds just don’t cut it. Jeep needs to address it and should be a simple solution. Sadly mastering the 12 volt charging system is too complex for them. It’s a shame that such a simple thing makes owning a Jeep a terrible experience knowing you will eventually be left stranded one day unless you replace your batteries every 3 weeks.

Hold on, you’re asking a company that can’t build a reliable manual transmission/clutch system after 80 years of trying to master the art of electricity? Good luck with that

 

[Remorseless]

Hold on, you’re asking a company that can’t build a reliable manual transmission/clutch system after 80 years of trying to master the art of electricity? Good luck with that

Ironically, LuK builds the OE clutch if I'm not mistaken. Not even Jeep's part.

 

[grimmjeeper]

Hold on, you’re asking a company that can’t build a reliable manual transmission/clutch system after 80 years of trying to master the art of electricity? Good luck with that

It's probably just that the bean counters force them to under spec components to meet a price point even though they won't last. What do they care once the warranty expires?

 

[Bandit59]

I love everything about my '21 JLU Willys Edition, except the Auxiliary Battery and the pesky Battery Charge Warning Light. The first time the Warning Light appeared, maybe a year or so into ownership, the dealer replaced both the Main Battery and Auxiliary Battery. Everything was fine until the warning light appeared again, maybe a year or so later. The dealer installed a new Auxiliary Battery, which did not charge. That didn't solve the problem so back to the dealer, this time to replace the Main Battery. Four new batteries to the dump, and counting. About a year ago, the Jeep wouldn't start. You guessed it: Battery Warning Light back on. Called AAA, who helped me jump start the Main Battery. Then back to the dealer, who replaced both the Main and Auxiliary Batteries. Now six relatively new batteries had been removed and sent to the dump. The local Jeep dealer suggested coming in to test the batteries before the first 36 months went by, as the "Extended Warranty" does not cover the one problem I keep having with the Auxiliary Battery. Two weeks ago, after driving the day before, the Jeep wouldn't start. This time, the same AAA driver came by, jump started the battery, but the Battery Charge Warning Light stayed on. With six relatively new batteries in the local dump, a Jeep that wouldn't start, the prospect of buying two more batteries despite an "Extended Warranty", less than 29k miles in under 39 months, lots of money spent on mods, clean Carfax and nothing else wrong other than not starting, a Warranty that doesn't cover the things that break, six relatively new batteries in the dump, and getting to know the local AAA Roadside Assistance guy who remembered the last visit, that was it. I traded in my Jeep. I loved my Jeep but need something that starts when I press the ignition. No need for @JeepCares, but as so many know, the Auxiliary Battery is a defective design, and I will gladly work with a Class Action attorney or @NHTSA.

Factory batteries r junk. I have a 23 and I suspect it will be done in 2yrs. I have a 2919 ram replace battery about 2 ys. I also have a 2020ram still has factory battery But most people just buy a good battery at the parts store and roll on

 

[MK212MX]

Jeep should be able to fix it, agreed. But, if they can't, do you just roll over and give up? Up to you. I wouldn't.

So you would willing give up the standard warranty, and the extended warranty you paid extra for?

 

[Punkn89]

So you would willing give up the standard warranty, and the extended warranty you paid extra for?

They aren’t going to cancel the WHOLE warranty if you deleted or bypassed the aux. Calm down.

Bypassing would be smarter if you plan to bring it in to the dealer because it’s easy enough to put it back.

And yes, I’ve bought many cars out of warranty and worked on them myself or had a reliable mechanic. The Jeep dealer is the last place I would bring it to.

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