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OK, just to close it off: Had two dead batteries, tried slow and fast charging both, they are now on the scrap pile. I changed the truck to two batteries, and have had zero issues. Weird that both went bad together

Well I am stumped. The two batteries in the spots closest to the frame continue to go dead. The alternator is charging correctly (14.4, 27.7) on both ports, and the batteries take a charge off of a charger perfect. But they go dead. When reading voltages on the batteries while engine is...