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Auxiliary Battery (tp2)
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Question
djv1951
I have a 2004 2500HD Silverado with 41,000 miles on it. I have the Auxiliary battery option (TP2) on it. Can you explain to me how it works? I've read several posts in the HD fourm and there seems to be some confusion how the system works. I have even asked 3 GM tecs at 3 different GM dealerships and all three differ. Does the starting system use both bateries to start the engine?, do both battries charge at the same time?, If I replace the main battery should I replace the aux. at the same time? Thanks, Dave
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