Aux Battery Swap for H8 Main Battery

[gram10]

Like someone posted before you can remove the aux from the equation if it fails. We do something similar on the wrangler JL’s with the aux battery. Even with a jump when the aux fails the Jeep will not run.

Aux Battery Delete-

Room for an H8 main battery which is the next mod.

1. Pull fuse F52
2. Remove negative jumper from aux to main
3. Disconnect + cable from aux battery.
4. Disconnect N3 cable from main bus. This is the aux + cable
5. Remove aux battery

ESS still functions as normal but no longer uses the aux battery at shut off. Everything is running off the main battery at all times like most other major oems. No CELs or codes.

None of the jeeps had the second current sensor at least in the research i did, that's my only hold up in doing this. I'm not sure what that sensor controls or how the computer would react if it saw that sensor not seeing any current.

 

[frogjbm]

None of the jeeps had the second current sensor at least in the research i did, that's my only hold up in doing this. I'm not sure what that sensor controls or how the computer would react if it saw that sensor not seeing any current.

Why not connect the Aux sensor from negative terminal to Main negative terminal after Aux delete?

 

[gram10]

Why not connect the Aux sensor from negative terminal to Main negative terminal after Aux delete?

That was a thought i had... don't know ow if I want to be the guinea pig and fry something haha. Also, right now don't have time to aimlessly ti ker and test, near future possibly

 

[Ctech-Review]

Like someone posted before you can remove the aux from the equation if it fails. We do something similar on the wrangler JL’s with the aux battery. Even with a jump when the aux fails the Jeep will not run.

Aux Battery Delete-

Room for an H8 main battery which is the next mod.

1. Pull fuse F52
2. Remove negative jumper from aux to main
3. Disconnect + cable from aux battery.
4. Disconnect N3 cable from main bus. This is the aux + cable
5. Remove aux battery

ESS still functions as normal but no longer uses the aux battery at shut off. Everything is running off the main battery at all times like most other major oems. No CELs or codes.

I was able to get my RHO finally started in that last video and drove 20 miles to dealer with a bad main and aux battery. It was not easy to get going but we got it there.

 

[MurphNH]

Even if you guys don’t delete the aux you should keep the instructions if and when the aux dies and the truck won’t start. Be much easier to use a jump pack with only 1 battery in the mix. I leave my JL aux charged and ready as a booster if my main ever has issues. All I have to do is connect the neg and put the fuse back in.

 

[gram10]

Even if you guys don’t delete the aux you should keep the instructions if and when the aux dies and the truck won’t start. Be much easier to use a jump pack with only 1 battery in the mix. I leave my JL aux charged and ready as a booster if my main ever has issues. All I have to do is connect the neg and put the fuse back in.

Are you the guy on Facebook who did not have the sensor on your aux?

 

[mike12193]

I just read the jump start instructions for the dual battery setup and are they referring to the aux battery as the remote battery? Kinda funny they have a picture of how to hook up a normal single battery system but not the dual.

 

[MurphNH]

Even if you guys don’t delete the aux you should keep the instructions if and when the aux dies and the truck won’t start. Be much easier to use a jump pack with only 1 battery in the mix. I leave my JL aux charged and ready as a booster if my main ever has issues. All I have to do is connect the neg and put the fuse back in

Are you the guy on Facebook who did not have the sensor on your aux?

No, I have the sensor on mine.

 

[gram10]

Even if you guys don’t delete the aux you should keep the instructions if and when the aux dies and the truck won’t start. Be much easier to use a jump pack with only 1 battery in the mix. I leave my JL aux charged and ready as a booster if my main ever has issues. All I have to do is connect the neg and put the fuse back in

No, I have the sensor on mine.

so you've done the aux battery delete on your RHO?

 

[MurphNH]

No, I have not done it yet... Guess I was waiting to see if you remove or double up the sensors. I will 100% give it a try if I walk out to a dead truck again though.

 

[RaMatt]

Subbed to this thread. My truck died in the railcar yard and took an extra month to get to the dealer. Wait and see.

 

[MurphNH]

Anyone ever figure out how to remove the auxiliary battery that has a voltage sensor on it? Had the truck batteries go completely dead two times now and lately when I forget to turn off auto start stop when it goes to start up it throws a check engine light and every other drive my proximity sensors won’t work. Think the aux battery is on the way out and just want it gone.

 

[RamFan]

Anyone ever figure out how to remove the auxiliary battery that has a voltage sensor on it? Had the truck batteries go completely dead two times now and lately when I forget to turn off auto start stop when it goes to start up it throws a check engine light and every other drive my proximity sensors won’t work. Think the aux battery is on the way out and just want it gone.

Just get both batteries replaced under warranty.

Chris

 

[ROCKO]

Such a strange issue with the current trucks as I’ve never encountered a new battery failing so rapidly. With those who have had batteries replaced on their new RHO, are the new batteries working out better?

Yes

 

[MurphNH]

Just get both batteries replaced under warranty.

Chris

Went in today and they would not replace my batteries. Said it is the digital key control module that is bad. No estimate on when the part would be available and they wanted me to leave it until the part came in without giving me a loaner. Ordered a Noco 5amp weatherproof charger and I will just plug it in every night for now. Was shocked they refused to even try new batteries and even if I paid them and the problem went away they still would not refund me. Definitely not impressed with ram service departments

 

[truckguy]

Went in today and they would not replace my batteries. Said it is the digital key control module that is bad. No estimate on when the part would be available and they wanted me to leave it until the part came in without giving me a loaner. Ordered a Noco 5amp weatherproof charger and I will just plug it in every night for now. Was shocked they refused to even try new batteries and even if I paid them and the problem went away they still would not refund me. Definitely not impressed with ram service departments

I have yet to meet a ram dealer that is willing to give a loaner or cover costs of rental or do anything to help until RAM the manufacturer steps in. We really need to get away from dealers and just have manufacturers sell cars.

 

[AirRyan]

I have yet to meet a ram dealer that is willing to give a loaner or cover costs of rental or do anything to help until RAM the manufacturer steps in. We really need to get away from dealers and just have manufacturers sell cars.

I don't know when this exactly happened, COVID was part of it, but I'm sick of this notion. Jeep told us they would reimburse us for a rental when our GW had t have it's thermostat replaced, but even for RAM, this is unacceptable. And GM thinks people are going to spend $150k on a C8 Z06 or $200k+ on a new ZR1 and get the same treatment as you would if you had a Chevy Trax? Negative.

Remind your dealer of the lemon laws in your state and that the clock starts ticking the day you leave your vehicle at the dealer without a loaner or rental.

 

[Steadi]

I have yet to meet a ram dealer that is willing to give a loaner or cover costs of rental or do anything to help until RAM the manufacturer steps in. We really need to get away from dealers and just have manufacturers sell cars.

I dunno man, I’ve brought my RHO in twice for defects in paint and the like and both times my dealer provided a loaner no questions asked. I’m sure there are dealers out there that don’t have the same level of customer service but that has not been my experience and why I will continue doing business with my dealer. They have been absolutely fantastic.

 

[Dark Knight G45]

I have yet to meet a ram dealer that is willing to give a loaner or cover costs of rental or do anything to help until RAM the manufacturer steps in. We really need to get away from dealers and just have manufacturers sell cars.

Damn, I am getting a loaner with my oil change!
Had to book it 2 weeks out but that’s not bad considering other brands (Mercedes, Land Rover) are sometimes 1-2 months until a loaner is available

 

[eltaco]

My dealer has always provided a loaner in the past, although it’s typically the lowest end Dodge Caliber or similar they have available.

That said, I just stopped in yesterday and scheduled my first appointment, and he said right now is their peak season, so getting a loaner is going to be difficult.