Start Stop battery out again

[Steph1]

Why dont you just install an underhood charger and plug it in when you’ll be a few days without using the Jeep or you only have short commutes coming up.

Been over a year now since I’ve done so and never had a problem again. My S/S always works immediately as soon as the engine gets up to temp.

If interested, just do a search in this forum and you’ll know exactly what to buy. Otherwise, let me know and I’ll help.

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[grimmjeeper]

I didn't bother to warranty my bad aux battery. All they do is replace it with another junk battery that will fail quickly.

I replaced mine with quality aftermarket batteries. And I run a trickle charger when it sits for a while.

 

[dchemphill1]

I didn't bother to warranty my bad aux battery. All they do is replace it with another junk battery that will fail quickly.

I replaced mine with quality aftermarket batteries. And I run a trickle charger when it sits for a while.

Thanks for all the info...maybe I will replace both. What is the best method to get to aux battery? Heard two ways and both say it is easy. Recommendations.

 

[Chupacabra]

My aux battery went off like half a year ago. With that, so did my auto start/stop. Never a problem until this past Sunday. My car wouldn’t start, just took it in to my dealer today and since I bough it pre-owned , sadly the battery wasn’t under warranty. Now I have to pay $1300 to get both batteries replaced, plus the battery sensor. Sucks .

Both batteries cost me about $350, replacing them is not difficult. If the IBS is bad, that's a $55 part. Who is charging you $1,300 to replace both batteries? That sounds way too expensive.

 

[humbleResident]

The dealer i bought it from :/

 

[grimmjeeper]

Thanks for all the info...maybe I will replace both. What is the best method to get to aux battery? Heard two ways and both say it is easy. Recommendations.

Mine is the diesel so there's only one way for me. It's under the main battery in a closed compartment with a lid. Not sure about the gas versions.

 

[Bill_P]

My aux battery went off like half a year ago. With that, so did my auto start/stop. Never a problem until this past Sunday. My car wouldn’t start, just took it in to my dealer today and since I bough it pre-owned , sadly the battery wasn’t under warranty. Now I have to pay $1300 to get both batteries replaced, plus the battery sensor. Sucks .

That's a rip off. Go buy the batteries and change them out yourself for about 4-500 bucks. Chances are high that your battery sensor isn't bad. Someone else here had a dealer that told them the exact same thing the other day.

 

[Fudster]

@dchemphill1 I mentioned two ways of bypassing the Aux battery. I missed one, the original:

https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/

same disconnect of negative cable off Aux battery, but a jumpered fuse between N1 and N2 in the PDC rather than a removed F42 fuse.

This is the original way. Be sure to turn off ESS if you go this route.

 

[Fudster]

The main battery was load tested and good in January...

Do note, if a load tester was put on the main battery and the negative cable from the Aux wasn't first removed, your load test was one that represented a composite test of both batteries, not the main battery.

Thanks for all the info...maybe I will replace both. What is the best method to get to aux battery? Heard two ways and both say it is easy. Recommendations.

@Rhinebeck01's way. Make sure you have extra fender clips. You can get to the battery through the top and not break fender clips but you might break more expensive to replace components.

https://www.jlwranglerforums.com/fo...ent-the-easy-way-pull-the-fender-flare.56807/

 

[roaniecowpony]

If you're willing to spend $1300, you may want to consider just biting the bullet and installing a dual Genesis battery system.

 

[Fudster]

If you're willing to spend $1300, you may want to consider just biting the bullet and installing a dual Genesis battery system.

IMHO the Genesis dual battery system, while excellent, is best left to those who desire power management for their after market appliances, particularly power hungry ones, and particularly when used in overlanding situations.

Yes, it will solve issues with the factory Aux battery, but so too, if you're willing to do without ESS, will simply disconnecting the Aux battery. To use the Genesis kit so you can run ESS is both IMHO overkill and cheaper methods, like trickle charging might be more effective.

To the "4" people out there who like ESS, ironically enough, the Genesis dual battery system will limit you to 6 ESS events per engine crank. While this may be more ESS events than many people experience in one trip, things happen this way because when the dual battery JL sees that the cables which normally connect to the Aux and main batteries from the factory have,--now connected to the Genesis setup--the same voltages prior to an ESS event, (which is what happens with the Genesis kit,) after 6 times of this it assume there some miswiring, and turns off ESS until the next cold crank.

 

[roaniecowpony]

IMHO the Genesis dual battery system, while excellent, is best left to those who desire power management for their after market appliances, particularly power hungry ones, and particularly when used in overlanding situations.

Yes, it will solve issues with the factory Aux battery, but so too, if you're willing to do without ESS, will simply disconnecting the Aux battery. To use the Genesis kit so you can run ESS is both IMHO overkill and cheaper methods, like trickle charging might be more effective.

To the "4" people out there who like ESS, ironically enough, the Genesis dual battery system will limit you to 6 ESS events per engine crank. While this may be more ESS events than many people experience in one trip, things happen this way because when the dual battery JL sees that the cables which normally connect to the Aux and main batteries from the factory have,--now connected to the Genesis setup--the same voltages prior to an ESS event, (which is what happens with the Genesis kit,) after 6 times of this it assume there some miswiring, and turns off ESS until the next cold crank.

Just tossing it out there, since most Wrangler owners will at one time or another do some type of off-highway trips and these "electric marvels" can benefit from the redundancy.

 

[Fudster]

Just tossing it out there, since most Wrangler owners will at one time or another do some type of off-highway trips and these "electric marvels" can benefit from the redundancy.

Certainly there are people out there both fed up with their Aux battery AND in need of overlanding power.

 

[dchemphill1]

I didn't bother to warranty my bad aux battery. All they do is replace it with another junk battery that will fail quickly.

I replaced mine with quality aftermarket batteries. And I run a trickle charger when it sits for a while.

What brand do you recommend. I think I am going to replace both.

 

[Buster1]

Those that have had the Aux Batt fail…. What are the symptoms? How do you know it’s failing? I’m just curious to know what to look for if it should start to happen to me. Thx!!

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