Aux battery and fuse f42

[badgladgirl]

I have been looking all over the forum for the specific issue and if it’s here, I apologize, but I can’t find it. as I pulled into work today, my auto start stop malfunction light lit up on the dash of my 2020 gladiator sport, and after watching some YouTube videos on how to disconnect the aux battery, I have run into some issues:
#1.). I have tried disconnecting both of the negative battery cables one at a time. Neither one will allow me to start the car. I originally disconnected the one with the larger bracket that was supposed to go to the ox battery after pulling the F 42 fuse, completely dead. Then I went back and hooked that one up and disconnected the other one and I would get some weird glitchy stuff and my windshield wipers kind of turned on and went really slow, but nothing else no dash nothing. I hooked up both of the negative cables back to their original location as they were before and left the F 42 fuse pulled, my truck starts. I seem to be retaining charge and I’m not getting any kind of trouble codes or dash lights.
What I want to know is it safe to drive this way with just the fuse pulled until I can pull the aux battery this weekend?
Thank you in advance for any help that you can give me because I am stuck here in this small town with no relative repair options

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[Gregj]

If you still have the original batteries they are likely bad and need replacing. All the symptoms you are describing are classic dead batteries stuff.

Now is a good time to replace the main battery and disconnect the auxiliary battery and pull that fuse and save the cost of the auxiliary.

Gregj

 

[Mr._Bill]

The information gets added to a lot of other threads. Reading all the battery related threads can be overwhelming.

The primary purpose of the Aux Battery is to keep the computers stable during ESS events. The two batteries are paralleled together all the time, except during ESS events and during the startup test for the Aux Battery. If you always press the button on the dash to turn off ESS, then you can attempt the Aux Battery delete with no expected issues. Otherwise, just replace both batteries. Pulling the F42 fuse just forces the startup test to look at the Main Battery instead of the Aux Battery.

There are two cables connected to the IBS on the negative post of the Main Battery. One is the cable connecting negative to the frame, the other is the negative cable from the Aux Battery. Disconnecting the frame cable should kill all power to the truck. Disconnecting the Aux negative cable will have everything running off the Main Battery.

When working with the batteries, keep the cable ends isolated. Unexpected shorts can blow fuses in the high current array on the side of the fuse box and result in other electrical issues.

Depending on the head unit you have, power loss causes a reboot that can take up to 24 hours for full recovery.

Fully charge new batteries before installing them. Completely disconnect the IBS for about ten minutes to reset it when replacing the batteries.

Sam's Club, Costco, and Walmart are usually the easiest sources, and all have equivalent warranties. Amazon doesn't require a core return, just be sure Amazon is the seller you purchase from.

ACDelco Gold 94RAGM (88864542) 36 Month Warranty AGM BCI Group 94R Battery https://a.co/d/eYyro4n

ACDelco Gold AUX14-200 (88866185) 36 Month Warranty Auxiliary AGM 200 CCA Battery https://a.co/d/4pjHO9T

 

[Lost1wing]

I have been looking all over the forum for the specific issue and if it’s here, I apologize, but I can’t find it. as I pulled into work today, my auto start stop malfunction light lit up on the dash of my 2020 gladiator sport, and after watching some YouTube videos on how to disconnect the aux battery, I have run into some issues:
#1.). I have tried disconnecting both of the negative battery cables one at a time. Neither one will allow me to start the car. I originally disconnected the one with the larger bracket that was supposed to go to the ox battery after pulling the F 42 fuse, completely dead. Then I went back and hooked that one up and disconnected the other one and I would get some weird glitchy stuff and my windshield wipers kind of turned on and went really slow, but nothing else no dash nothing. I hooked up both of the negative cables back to their original location as they were before and left the F 42 fuse pulled, my truck starts. I seem to be retaining charge and I’m not getting any kind of trouble codes or dash lights.
What I want to know is it safe to drive this way with just the fuse pulled until I can pull the aux battery this weekend?
Thank you in advance for any help that you can give me because I am stuck here in this small town with no relative repair options

Leaving f42 pulled and both batteries connected does nothing for you, except eliminates an early warning when one of your batteries begins to fail. One bad battery will drag down the other. So it is best to either keep both batteries and f42 in so the computer can see both or remove the Aux the proper way( not random YouTube videos). You can get some good info on YouTube, but there are a lot of hacks out there too.

 

[Rocksalt]

I have a 2020. Pulled fuse f42 and disconnected the aux battery neg cable 2 years ago. I dont use the ASS so I disabled the hood plumger. No issues at all except for Avengers dash light. Cheers!

 

[Proximo]

If you need guidance @badgladgirl I'd consult @Lunentucker on what to do with f42 and which negative. He has pictures and can walk you through it i bet

 

[Lunentucker]

It's stupid simple.
On a 2020 the larger ground cable will be the one to the aux, but even then it's really easy to tell if you detached the wrong one, because nothing will work.
In which case you put that one back and remove the other one.

The only thing I got wrong when I made this video was I assumed the ESS would not work after the procedure. It sill works fine.
Learn to push the button, lay the hood plunger down, or buy the goofy electronic doodad.... or let it work.

My new GMC has ESS and just one battery.

The notion that a second battery is needed to keep the electronics stable is preposterous, especially when it's usually the first battery to fail and cause electronics problems.
It only doubles you chances of being stranded.

 

[GI Grandpa]

I have been looking all over the forum for the specific issue and if it’s here, I apologize, but I can’t find it. as I pulled into work today, my auto start stop malfunction light lit up on the dash of my 2020 gladiator sport, and after watching some YouTube videos on how to disconnect the aux battery, I have run into some issues:
#1.). I have tried disconnecting both of the negative battery cables one at a time. Neither one will allow me to start the car. I originally disconnected the one with the larger bracket that was supposed to go to the ox battery after pulling the F 42 fuse, completely dead. Then I went back and hooked that one up and disconnected the other one and I would get some weird glitchy stuff and my windshield wipers kind of turned on and went really slow, but nothing else no dash nothing. I hooked up both of the negative cables back to their original location as they were before and left the F 42 fuse pulled, my truck starts. I seem to be retaining charge and I’m not getting any kind of trouble codes or dash lights.
What I want to know is it safe to drive this way with just the fuse pulled until I can pull the aux battery this weekend?
Thank you in advance for any help that you can give me because I am stuck here in this small town with no relative repair options

I just went through this and I pulled the aux battery, replaced the main battery, pulled #42 fuse and jumped the to right hand post on the back or engine side of the fuse box. Everything works great and all my apps and nav/unconnect features came back in a few hours.

 

[xcd]

I did mine - pulled fuse and aux battery . was working fine for a week then started having odd charging issues. I had to add the jumper between post 1&2 ( maybe it was 5&6-can’t remember off top of my head). Once I did that all has been fine and have proper charging. Maybe that’s unique to me : but I see you can buy a jumper for this purpose that has a fuse in it . I wouldn’t bother buying it and just make your own if needed. Clearly I’m not the only one or they wouldn’t make a jumper specific for this. If you look it seems like the jumper wouldn’t do anything , but I know for me it was the solution to charging issues after I did my aux delete.

 

[Lost1wing]

It's stupid simple.
On a 2020 the larger ground cable will be the one to the aux, but even then it's really easy to tell if you detached the wrong one, because nothing will work.
In which case you put that one back and remove the other one.

The only thing I got wrong when I made this video was I assumed the ESS would not work after the procedure. It sill works fine.
Learn to push the button, lay the hood plunger down, or buy the goofy electronic doodad.... or let it work.

My new GMC has ESS and just one battery.

The notion that a second battery is needed to keep the electronics stable is preposterous, especially when it's usually the first battery to fail and cause electronics problems.
It only doubles you chances of being stranded.

I would agree, unless you monitor the ESS page. When you see battery charging for an extended period of time, it's time to plug in the trickle charger. We shouldn't have to do this though. They could have done better. I'm still on both original batteries. I have to plug it in every couple of weeks, like an EV, just to keep the ESS functional.

 

[gonemad]

I would agree, unless you monitor the ESS page. When you see battery charging for an extended period of time, it's time to plug in the trickle charger. We shouldn't have to do this though. They could have done better. I'm still on both original batteries. I have to plug it in every couple of weeks, like an EV, just to keep the ESS functional.

I’m a brand new Jeep owner with a brand new Jeep. Please school me. Where is the ESS page to be found? Thanks in advance.

 

[Lost1wing]

I’m a brand new Jeep owner with a brand new Jeep. Please school me. Where is the ESS page to be found? Thanks in advance.

On the drivers display. Arrow up until you see it.

 

[Lost1wing]

I’m a brand new Jeep owner with a brand new Jeep. Please school me. Where is the ESS page to be found? Thanks in advance.

Once you see it, it will tell you that ESS is ready, unavailable (bad), or it will tell you why ESS is not ready.

 

[gonemad]

Once you see it, it will tell you that ESS is ready, unavailable (bad), or it will tell you why ESS is not ready.

Found it, thanks.

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