Dealer appointment for stop/start

[rconkin]

I took mine to the local dealer about 4 weeks ago for the same thing. I bought from an out of state dealer. I had made the appointment online so when I arrived he informed me the first thing they had to do was charge the batteries for 4-5 hours before checking them and there was also a flash to be done. At that point I told him I had changed to all led lighting and had the settings changed to led. I asked if he could be sure they remained on led and he said no problem. They called me that afternoon to tell me it was ready and they had replaced auxiliary battery and he had made sure the flash hadn’t changed my light settings. There was never anything said about my Voswitch nor winch. He basically told me to quit using ESS since most of my trips are 15-20 minutes.
It was Friendsip JCRD in Bristol, TN. I kind of wish I had purchased from them seeing how well they treated me without purchasing from them.

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[PsyRN]

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.

Betcha it's the AUX battery.
Dealer will likely replace both since you're under warranty.

Just had this done a couple of weeks ago. Took it in because it may or may not have been just the aux battery. Dealer replaced both under warranty after neither could hold a charge. I have a few accessories, and still have my Taser in place. My dealership doesn't seem to care, but ymmv. I've read about some dealerships that are not like that.

 

[Lunentucker]

Just had this done a couple of weeks ago. Took it in because it may or may not have been just the aux battery. Dealer replaced both under warranty after neither could hold a charge. I have a few accessories, and still have my Taser in place. My dealership doesn't seem to care, but ymmv. I've read about some dealerships that are not like that.

I'm sure this will get backlash from the defenders of Mopar batteries, but I've read numerous accounts of the AUX battery dying and essentially cannibalizing the main battery. Apparently the system isn't setup to monitor or to prevent that from happening.
Many many other vehicles get by just fine with just one battery. Jeep needs to get their act together on this problem.

 

[PsyRN]

I'm sure this will get backlash from the defenders of Mopar batteries, but I've read numerous accounts of the AUX battery dying and essentially cannibalizing the main battery. Apparently the system isn't setup to monitor or to prevent that from happening.
Many many other vehicles get by just fine with just one battery. Jeep needs to get their act together on this problem.

I agree. When the warranty runs out, and no more free batteries, I’ll probably do a bypass.

 

[sharpsicle]

I'm sure this will get backlash from the defenders of Mopar batteries, but I've read numerous accounts of the AUX battery dying and essentially cannibalizing the main battery. Apparently the system isn't setup to monitor or to prevent that from happening.
Many many other vehicles get by just fine with just one battery. Jeep needs to get their act together on this problem.

Nobody defends Mopar batteries. You're honestly making that up.

There's plenty of accounts of the opposite where mains fail first. Why make generalized assumptions with no basis? And yes, the system does do a test at start-up, hence people receiving these messages. Messages that can be triggered by the poor performance of either battery.

You get corrected on this in every thread you mention it in. Do AUX batteries fail? Yes. Do main batteries fail? Also yes. Do AUX batteries fail more often than mains? No. Do mains only fail because of the aux killing it? Absolutely not. Everyone just assumes they do because of misinformation like this being spread.

Just because both batteries get replaced does not mean the "aux killed the main". It just means either both were bad or the dealership was being prudent and replaced both anyway. You must test to verify, and you have an equal chance of either battery being the culprit.

 

[Lunentucker]

What prevents the AUX from draining the main when it's failing?

 

[Lunentucker]

 

[Andy29847]

I'm sure this will get backlash from the defenders of Mopar batteries, but I've read numerous accounts of the AUX battery dying and essentially cannibalizing the main battery. Apparently the system isn't setup to monitor or to prevent that from happening.
Many many other vehicles get by just fine with just one battery. Jeep needs to get their act together on this problem.

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.

 

[sharpsicle]

What prevents the AUX from draining the main when it's failing?

What prevents the main from draining the aux? What prevents both batteries from failing equally? What's to prevent anything from draining any battery? I think you're missing the point here.

What's this for? To show a battery failed on a vehicle? Yeah, it happens all the time...

What you're building here is a false sense of correlation based on anecdotal evidence. Which is just a fun way to say there's no basis for this ongoing claim. Show me some actual evidence where it shows that aux batteries are always the ones failing and are always the reason the main dies, then we might actually get somewhere.

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.

Exactly. It's basically one big battery as far as the system is concerned, except for ESS events and the momentary battery check that's done at a cold start. Other than that, it's all one big system. Even in a system like the Genesis, it's two batteries acting as one, and either can fail. The difference? People installing the Genesis are using higher-quality batteries, and as such they see lower failure rates.

That being said, either component can and does fail. The Jeep will detect this, maybe at a higher than desirable threshold I'll grant you that, but you'll get a notification. It's then up to you to do some troubleshooting and find the culprit before the rest of the battery system gets compromised. The longer you wait, the more risk you take on.

And you don't just go "ah, voltage is low, that damn aux battery again" and throw parts at it. You test. Could it be the aux? Sure. Could it be something else, like the main, instead? Absolutely. Gotta test it before assuming anything.

You get it.

 

[Lunentucker]

There doesn't seem to be pattern regarding which battery dies first.

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.

Interesting set of statements when paired together. It would appear that you assumed that the AUX battery would be the one most likely to fail and introduce problems, so you wisely took the proper steps to eliminate it from the equation.
Well done, and thanks for supporting my statements!

 

[Andy29847]

Interesting set of statements when paired together. It would appear that you assumed that the AUX battery would be the one most likely to fail and introduce problems, so you wisely took the proper steps to eliminate it from the equation.
Well done, and thanks for supporting my statements!

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.

 

[JeepCares]

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.

Hey there. If you need support at any upcoming appointments, feel free to let us know.

Kate
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[Lunentucker]

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.

That was one of the earlier ways of doing it, and it does work.
The simplest and easier way is to disconnect the AUX ground cable, tape it up and tie it out of the way, and remove fuse F42.
This method also makes it super easy for some future owner to undo the changes if they so choose.

 

[Lunentucker]

He's a bit wordy, he talks funny, and all of his stuff is on the wrong side, but he got it right. ?

 

[jmdwifi]

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.

Jeep put some serious junk batteries in these vehicles. I had my aux battery replaced twice, charged, checked, etc. I put the genesis dual battery system in. Start stop works as soon as the engine warms up everytime. I don't use it, so I didn't really care if it didn't work before. I was suprised at how it works all the time now.

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