Doors off and battery dead

johneversight

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First time Jeep owner / first time post.

I'm have a battery problem and looking for advice. We took the doors off our 2018 JLU a couple of times now without issue, kids love it. Two days ago we took the doors off again and after sitting for a day and a half, found we had a dead battery. So, I'm wondering if there is an obvious issue we need to look out for. I'm wondering if maybe the dome lights don't shut off automatically? Are there lighting setting we should change when we run with the doors off? Any advice would be great.

Thanks
-John
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TrailScooter

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It was inevitable; when fuel prices are high people steal fuel. With the rise of electric vehicles, electricity theft is on the rise. :giggle:
 
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johneversight

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OMG!

While I didn't get the advice I was hoping for I got a good laugh. :clap:
Thanks for that.
 

Rhinebeck01

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@johneversight

IF the JL was not placed in Park and then the ignition turned off..... and the vehicle was left hours/overnight, etc. the batteries would be depleted..

By the way, your 2018 JLU has 2 batteries. A Main and an Auxiliary battery that reside under the power distribution center.

Also, your 2 batteries are near the end of their life cycle. You will very soon be replacing them.
 

NewJLU2019

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Just to add. I had my doors off for almost 3 months. When I use the rear back door my dome lights come on but go off after like 20 seconds. Unless your dome light knob on dash has been moved your dome lights will not stay on.

@Rhinebeck01 is probably right on if you still have original batteries.
 

Rhinebeck01

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Just to add. I had my doors off for almost 3 months. When I use the rear back door my dome lights come on but go off after like 20 seconds. Unless your dome light knob on dash has been moved your dome lights will not stay on.

@Rhinebeck01 is probably right on if you still have original batteries.
@NewJLU2019

Interior lights will always time out regardless..
 
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johneversight

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@johneversight

IF the JL was not placed in Park and then the ignition turned off..... and the vehicle was left hours/overnight, etc. the batteries would be depleted..

By the way, your 2018 JLU has 2 batteries. A Main and an Auxiliary battery that reside under the power distribution center.

Also, your 2 batteries are near the end of their life cycle. You will very soon be replacing them.
Thanks for the input. It's possible the Jeep was turned off out of park sine we had been moving it around the driveway several times while doing a fender mod. I'll keep an eye out for that.
 
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johneversight

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Just to add. I had my doors off for almost 3 months. When I use the rear back door my dome lights come on but go off after like 20 seconds. Unless your dome light knob on dash has been moved your dome lights will not stay on.

@Rhinebeck01 is probably right on if you still have original batteries.
Thanks for your input, I was really wondering how the lights behaved with the doors off so its good to know I don't need to worry about kids leaving the dome light on and killing the battery.
 
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johneversight

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@johneversight

IF the JL was not placed in Park and then the ignition turned off..... and the vehicle was left hours/overnight, etc. the batteries would be depleted..

By the way, your 2018 JLU has 2 batteries. A Main and an Auxiliary battery that reside under the power distribution center.

Also, your 2 batteries are near the end of their life cycle. You will very soon be replacing them.
Yes, the batteries are at or approaching EOL. CarMax warranty is currently replacing the auxiliary battery. Just had the dealership do a 30K mile service and they made no mention of the primary battery being EOL. I'll need to check on the primary battery.
 

Rhinebeck01

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@johneversight

Ok... but you added more pieces to the puzzle so to speak with your last post.

Just so you know.... your JLU may have an Aux. battery that is shot... ready to go belly up any minute lets say... your old Main is probably on it's last legs also. Only way to tell is to have them both load tested separately.

IF your 2018's, Aux battery gets to a certain level of depletion, your 2018, will not start.... will not start even if the Main battery is fully charged/not depleted..

Unlike the 2019-2021 JL's, your 2018 will not start on the second try if the Aux battery is depleted. So, depleted Aux and you will have a no start situation...

Again, 2019-2021's behave differently. You can have a TSB applied to your 2018 JL that will make it behave like the 2019-2021's.
 
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