SilveradoSierra • How to hook up dual batteries Aug 17, 2014The mounting procedure is identical to that of the isolator. It is also placed on the firewall directly above the wire coming from the alternator. Step 3. Install the fuse holder intended for dual battery use. I purchased my holder (P/N 19116352) and cover (P/N 15881616) from gmpartseast. It is a direct swap with the single fuse holder. GMC dual battery install | Medium Duty Work Truck Info Stock Chevy/GMC 1500s come with a single Group 48 battery located in the passenger’s-side rear corner of the engine bay. There’s also an unused battery tray on the driver’s front corner; there’s no TP2 (dual-battery option) for the 1500s, so it’s bit of a mystery why it’s there.
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