1932jimExplorerOct 09, 2013auxiliary battery for new gmc pickuphas anyone added a second battery to their new gmc pickup. my truck came with a second location for a battery but the manual details are not clear on what to do about wiring in the battery so that it...Show More
poncho62ExplorerOct 09, 2013You need an isolator...RV places have them...they use them so a coach battery in motor homes dont go dead.Isolator
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