GMC dual battery install
Upgrading to dual batteries gives working Chevy/GMC 1500s a big electrical buffer; Odyssey and Cole Hersee make it easy
By Bruce W. Smith
Turning the key to discover nothing but a dead battery isn’t fun. But it happens.
Inverters, coolers, radios, warning strobes, laptops, battery chargers, printers and other necessary accessories put a big drain on any pickup’s stock electrical system when the truck is on a jobsite with the engine off.
Even with the engine running the amp load needed to power such an array of accessories can put a strain on the stock electrical system of today’s half-ton pickups.
Add a plow , connect to a weak trailer battery, or flip on auxiliary driving, fog, or work lights and the battery is going to take a hard hit. Sometimes hard enough to leave you stranded.
In preparation for adding an inverter, warning lights, and a few other work truck “necessaries” on Project Bedrock — our 2011 GMC Sierra 1500 Crew Cab 4×4—we decided it was a good idea to double-up the batteries.
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.