Quote:
Originally Posted by VCho455
Also commonly found in pickups with dual batteries and tow vehicles with batteries in the trailer that are charged by the truck. They were factory options as far back as the late 1960's on GM's and other manufacturers.
Allowed you to run the lights in your camper all night and still be able to start the engine in the morning
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These are true. Also, dissimilar batteries need to be isolated as well, they will discharge if joined.