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First of all, I NEVER mentioned using a 60 amp, go back and read my post. 60 amp has no 14v tap. Secondly, TCM equipped trucks would have 200amp gens. Ive been doing hmmwv crap for a few minutes “20 plus years” never had any issues on ANY truck I’ve owned just taking 12v off the rear battery...

AM General feeds ALL 12v components from the rear battery...TCM primarily, the 14v tap from the gen takes care of the imbalance. If it’s so bad, why does the mfg do it?

Let me make this simple...you have no need for a 3rd battery or a 12v converter with the 200amp and 14tap tied to the rear battery. Just run all your 12v items to a power strip off the pos of the REAR battery, pull the ground from the shunt. done...that 200amp gen was designed to run way more...