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Aux Battery Swap for H8 Main Battery

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Well at least we all seem to have these, I would be hesitant to remove the auxiliary battery now considering these current sensors are probably giving the computer a reading for a reason...
 
I learned recently on my wife's QX80 they monitor the battery and stop charging it to "save gas" if it doesn't think the battery needs a charge. This leads to it killing batteries more quickly than normal. We've had the vehicle for 8 years and am on the 4th battery for it.... Maybe something similar here?
 
Interesting, leads me to a few questions.
1. If both sensors are hooked up to the main battery, will everything operate properly?
2. Why are there different sensors for each battery?
3. The aux batt sensor is discontinued apparently and not listed for the rho, why?
Aux sensor: https://www.shopmoparautoparts.ca/p...mdD1iaWctaG9ybiZlPTMtNmwtdjYtZWxlY3RyaWMtZ2Fz
Maim senesor:
 
why are there 2 batteries anyway when if one dies it kills the other one too? lol
 
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Have dual sensors as well. No issues so far >900 miles.
 
Not 100% sure but I believe having one IBS vs. 2 IBS has to do with what options the trucks are built with. The higher end loaded trucks(all ram models) seem to all have the dual IBS, while the lower end trucks i have seen a lot with only 1. Curious to look and see if the Level 0 vs. Level 1 has one or both based on load out.
 
moparfiend said:
I'd like to know about that as well, do we need to hook up both to the charger or just primary?

What would be a better solution, if someone wants to figure out how to do the true dual full size battery's like the diesel 2500's/3500's have with voltage isolation option.. one can dream right
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Did anyone ever figure this out (if we need to trickle charge both batteries or just the main)? I bought one of the NOCO dual bank (2A per bank) because I am going away for a week at the end of the month and really don't want to risk getting back to a dead truck.

Does anyone know if trickle charging both would hurt? I can't see how it would, they are both 12V AGM batteries...the chargers will sense when the batteries are "full" and go to float so I can't see how it would be bad but I am also dumb so....
 
What are the specs on the Auxiliary battery?
 
For what it is worth, I checked out a few different jeep forums and it sounds like, vehicles with the main and aux battery, are wired in parallel. So we don't need to trickle charge both batteries, just the main - which will feed the aux battery (assuming both batteries are functioning properly).
 
Deange2001 said:
For what it is worth, I checked out a few different jeep forums and it sounds like, vehicles with the main and aux battery, are wired in parallel. So we don't need to trickle charge both batteries, just the main - which will feed the aux battery (assuming both batteries are functioning properly).
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That's true and a great point. Watching @Ctech-Review battery replacement video, you can clearly see the negative terminal from main also jumps over to auxiliary battery's negative post. In other words, you don't need a dual bank charger for these, only a single is sufficient.

HOWEVER, I did notice the auxiliary battery's Amp Hour is rated at 14Ah, meaning watch the amp rating on the charger you put on it. Can we run a charger that's rated at 10 amps or even 20 amps to it safely? Or...should we stay within 5 amps only?
 
frogjbm said:
That's true and a great point. Watching @Ctech-Review battery replacement video, you can clearly see the negative terminal from main also jumps over to auxiliary battery's negative post. In other words, you don't need a dual bank charger for these, only a single is sufficient.

HOWEVER, I did notice the auxiliary battery's Amp Hour is rated at 14Ah, meaning watch the amp rating on the charger you put on it. Can we run a charger that's rated at 10 amps or even 20 amps to it safely? Or...should we stay within 5 amps only?
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I am not an expert (but I did stay at a holiday inn express last night), but it will depend on your use case. If you are using it as a battery tender or trickle charger, I'd think you want to stay below 2A. If you are planning to use it as more of a battery jumper you would likely want 10A+.

All that said, I am not sure it really matters because they are all smart chargers and should be able to sense when the battery is charged and go into float mode. I personally have a 2A battery tender and a separate battery jumper/charger that can source or provide more current to the battery.
 
this can all be a moot point if we can get rid of the aux and use an h8! I would really like to try it by just removing the fuse, then covering the positive and negative aux connectors and see if the h7 will work. Just no time to do it. my fear is the aux battery sensor not seeing any current will make the truck throw codes.
 
gram10 said:
this can all be a moot point if we can get rid of the aux and use an h8! I would really like to try it by just removing the fuse, then covering the positive and negative aux connectors and see if the h7 will work. Just no time to do it. my fear is the aux battery sensor not seeing any current will make the truck throw codes.
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I agree but I am way to big of a puss-puss to try this out on mine haha. I have been problem-free since my first night when the batteries died (aside from getting a tear in my front driver CV boot) and I don't want to rock the ship here.
 
Deange2001 said:
I agree but I am way to big of a puss-puss to try this out on mine haha. I have been problem-free since my first night when the batteries died (aside from getting a tear in my front driver CV boot) and I don't want to rock the ship here.
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haha exact same here
 
We need to figure out the proper way to jump one of these trucks in case battery dies, for some of us being stranded is not an option. Need a fall back option in case one or both die.
 
Ctech-Review said:
We need to figure out the proper way to jump one of these trucks in case battery dies, for some of us being stranded is not an option. Need a fall back option in case one or both die.
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Jump start instructions are on pp. 292-293 (PDF 294-295) of the Owner's Manual or the attached doc.
 

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Ctech-Review said:
We need to figure out the proper way to jump one of these trucks in case battery dies, for some of us being stranded is not an option. Need a fall back option in case one or both die.
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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.
 
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