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2 yellow leads on rear battery for 4L80e trucks.. one is TCM 12 v feed, the other is the 14v tap from the regulator to prevent battery imbalance.

it’s not a split system, per sey....any hmmwv can add a 200amp gen and you have the capability. the 200amp is the standard for ALL trucks...60amp is out of the system. even than...most accessories don’t draw enough noticeable amps to make a difference anyway.

so what your saying is AM General did it wrong and the internet experts way of doing it is the correct way? yea, I don’t think so....OEM pulls all 12v from the rear battery, the job of the 14v tap off the regulator is to correct any imbalance, it’s clearly working in how many current hmmwv’s. As...

Not sure what this “Lower battery” is...it’s either a front or rear battery in reference to the truck. pull direct from the “Rear battery, both pos and negative, never use body as a ground. To make it easier, run a positive and negative to a good Marine grade fuse block, as high up as possible...