2018 Jeep Wrangler JL

[Ironbuff]

Good evening everyone I had a quick question.

Two days ago, I went to start my Jeep and the head light flickered and the jeep did not start. I did it a second time, same thing. The third time it finally started. I did some research and they said it could be possibly the battery on your key fob not working so I grabbed my other key fob and the Jeep started fine, but now I have the start to stop light indicator on my dash illuminated. This has happened before, but then disappeared. My start to stop hasn’t worked in a year. (Which I’m glad because I never used it).

My question is do I need to replace the auxiliary battery? Second question why even have the aux battery?

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[jman]

It's probably the main battery not the aux. At least that was the case for my 2018 JL. I replaced the AUX and nothing changed then replaced the main and start stop - started working again.

Also if you do replace the AUX battery, go in through the fender it's much easier.

 

[Ironbuff]

Thank you Jman for replying. I just replaced my main battery just under a year ago. I also got it checked at O’Reillys and they said the battery and alternator are good.

 

[running_man]

Thank you Jman for replying. I just replaced my main battery just under a year ago. I also got it checked at O’Reillys and they said the battery and alternator are good.

Probably a silly question, but did you replace it with an AGM battery? I bought my Jeep used and the dealership had replaced the battery with just a regular battery....it lasted less than 14 months. Replaced it with a AGM battery and haven't had a problem since.

 

[jman]

Probably a silly question, but did you replace it with an AGM battery? I bought my Jeep used and the dealership had replaced the battery with just a regular battery....it lasted less than 14 months. Replaced it with a AGM battery and haven't had a problem since.

I forget the type of battery I got, It was the only one that Oreily's had that fit. We had opposite battery failures but my big one is def on the way out but I am getting a 2024 soon (I hope) so I won't be replacing it.

 

[Headbarcode]

Our JL's are picky when it comes to battery condition. They have a higher voltage threshold between happy and not happy, so good may possibly not be good enough.

Also, a healthy battery won't last nearly as long as it could have after its been used as a crutch by a weaker one. It's always best to replace both batteries at the same time, otherwise there's a good chance of having a repeat premature electrical issue down the road.

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