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That eaton box makes a lot of sense. Is the stock dual voltage hmmwv regulator doing the same/similar thing to keep things reasonablfy balanced? From voltage behavior I'm seeing, the regulator is clearly doing something different between the 12v and 24v outputs.

Yes, just saying that you can get to amp hours once you have the current from the shunt (and obviously the voltage and duration). I'm not saying the hmmwv is using it's shunt that way. I assume there is nothing "intelligent" going on in this system like with a modern car with shunt and smart...

Thanks. Yeah, I get the concept, just wondering how it works. I figured there are no fancy electronics here comparing voltages between the batteries, but maybe there is some simple logic/method in the voltage regulator keeping a balance? I just assumed it was analog based on the wide...

Thanks for the replies. Based on the feedback, it does sound like that yellow insulated wire on the back battery is a power supply from the 12v generator output. After doing more testing, it see that the 12v output runs high for a bit (I've seen it as high as 15.4v), but settles down after a...

I'm trying to understand the design of the electrical system on my m1123 and trouble shooting a battery balance issue. I have the 200a dual voltage generator. Everything seems to be working OK, but I have a pretty significant battery imbalance. It's not the batteries because I've swapped...