Dealer appointment for stop/start

[ecidiego]

I'm late to the Jeep game and have a minimum amount of experience with the start/stop system. In fact, my best skill might be internet research. There are a number of members here who have invested a lot of time and study on the Jeep battery system, and then they freely and frequently shared their knowledge. One of them made the drawing below. I haven't seen things explained any better than on this drawing (I think Bill is the author).

When my Jeep was in warranty, and the stop/start-charging light came on, I went to the dealer. Three visits later they replaced my main battery. I wasn't happy. I wanted 2 new batteries. I fully expected the problem to come back. It has not. In the meantime, my original factory warranty expired. Since my main battery was new, and my aux battery was old, I thought it made perfect sense to disconnect the aux battery. In felt like there was a strong chance that the old aux battery would go bad sometime in the near future and damage to newer main battery.

I drive my Jeep weekly. I turn off the stop/start as soon as I think about it - normally when it operates the first time. I don't believe I need 2 batteries.

Something changed here in 2021s, escapes me what it was. Has to do with the grounds.

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[ecidiego]

'm now out of warranty and going to have some out-of-pocket battery expenses upcoming.

Good news is you'll be getting a far better battery.

 

[Lunentucker]

Something changed here in 2021s, escapes me what it was. Has to do with the grounds.

They flipped the cables. The larger diameter ground is connected to the AUX, instead of the smaller one.

 

[Tuggernuts]

The batteries in our JTs are wired in parallel, i.e., hooked together. The only time they are separated is during a stop/start event. Naturally, when one battery begins to lose power, it effects the other battery. There doesn't seem to be pattern regarding which battery dies first. I'm sure it depends on usage. In my truck, the main was the bad battery. Complicating this issue is that the stop/start system seems to quit working at 12.4 volts. 12.4 isn't a bad reading for a 2+ year old battery.

I have a 2020 JLU as well as a 2020 JT. When my new car warranty was over on the JLU, I disconnected the aux battery (removed the negative lead, insulated the end of the lead, secured the end with cable ties, removed fuse F42). The stop/start still works as designed, it is just working on one battery.

FWIW, JTs were delivered with at least 2 different sized main batteries. The size of the battery determination was made by model and options choices. I believe the larger battery is an H7-group 94 battery.

Curious, do you advise going with a bigger battery when you do the aux delete?

 

[Orange01z28]

I turned off my start stop with a Taser

Then a message came on saying it's not functioning correctly. I'm happy it doesn't work anymore

 

[sharpsicle]

I turned off my start stop with a Taser

Then a message came on saying it's not functioning correctly. I'm happy it doesn't work anymore

Don't ignore that message. It's usually a sign that there's a problem somewhere that needs to be fixed. Start/stop is the first system to stop working when things aren't right, but others could follow depending what the problem is. It's a symptom of something else.

 

[Lunentucker]

I turned off my start stop with a Taser

Then a message came on saying it's not functioning correctly. I'm happy it doesn't work anymore

I don't think that decouples the two batteries and they can still cause each other problems.

 

[Orange01z28]

I replaced the main battery last summer.

I do need to get off my ass and permanently bypass it

 

[Andy29847]

Curious, do you advise going with a bigger battery when you do the aux delete?

No advice from here on that issue. My long term thinking includes adding a winch (and a Wench ). Also, while nosing around under the hood, I noticed that the battery tray seems to have some extra space. Putting those 2 things together is what has me thinking about a bigger battery. FWIW, when my dealer replaced the main battery last December, they installed a new Interstate Battery (700 CCA). Without doing any research, I believe that is a very good battery.

 

[rezar1]

Thank you all for your feedback including @JeepCares for offering to help.

The dealer checked both batteries and deemed that both needed to be replaced. Both were replaced under warranty which was great. Also had the oil changed and rotated the tires which happen to be 37s under Jeep Wave program. I didn’t think they would do 37s but they did.

I will most likely go the genesis route once my warranty runs out.

 

[Lunentucker]

Thank you all for your feedback including @JeepCares for offering to help.

The dealer checked both batteries and deemed that both needed to be replaced. Both were replaced under warranty which was great. Also had the oil changed and rotated the tires which happen to be 37s under Jeep Wave program. I didn’t think they would do 37s but they did.

I will most likely go the genesis route once my warranty runs out.

Predictable. Hopefully that was your only issue and these will carry you past warranty ?

 

[Andy29847]

FWIW, when my dealer replaced the main battery last December, they installed a new Interstate Battery (700 CCA). Without doing any research, I believe that is a very good battery.

Sometimes you write something and then you have second thoughts. Late last night I decided I should try to verify my good feelings about the new battery my dealer installed in my Jeep.

My battery is not the best group 94 battery that Interstate makes. The MTP-94R/H7 battery rates 790 Cold Cranking Amps and 130 minutes of reserve capacity. The Interstate MTX-94/H7 has 850 Cold Cranking Amps and 140 minutes of reserve capacity - roughly 8% "stronger/better.

The next battery size up from the group 94/H7 batteries would be group 49/H6. These batteries are 1-1/2" longer. I have not verified the fit on my Gladiator. Premium group 49 batteries generally are rated at 900 Cold Cranking Amps and 160 minutes of reserve capacity (a 13% improvement over my current battery).

I referenced this article for info:
Best Group 94R/H7 Batteries 2022 [Review & Buyer's Guide] - Battery Globe

 

[Deb W]

So I have a appointment for the dealer to look at my stop/start warning I am getting which has disabled the system. I am guessing it's related to AUX battery going bad.
I wanted to find out if the dealers give people a hard time about AUX battery not working if you have accessories installed. I have a winch that has a switch to cut it off from battery. It's been off since the day I have installed it. I have RSE sliders that have the switch to turn it off and I also have Falcon ADAPT shocks. My truck is still under warranty.

So, if both batteries test fine, then have them check the star connectors. My 2022 - brand new, gladiator had a corroded star connector. Took the dealer over 45 days in and out of the shop to find the problem. Don't get me started on why a new gladiator would have a corroded connector having less than 1000 miles. Best of luck!

 

[Seymore76]

Mine was both batteries were bad. Of course I was not aware until the JT died doing down highway at 70mph.


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[apiv]

Have the same issue. Truck has never been idle for more than 48 hours. Main Battery seems to be in good shape.

Wanted to take it into the dealer here in Canada and was told that electrical issues take minimum two weeks to sort. Sorry WHAT?

I could do it in two hours, I just dont have the gear.

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