But here’re the basics of how we went about adding a second battery to a 2011 GMC Sierra 1500 Crew Cab 4×4.Īn Odyssey battery and Cole Hersee smart battery isolator makes it easy to add a second battery under the hood of later-model GM 1/2-ton pickups. Whatever the reason, that second battery tray simplifies the installation of the second battery. Why it’s there is a mystery because there’s no TP2 dual-battery option for the 1500s. There’s also an unused battery tray on the driver’s front corner. The best way to minimize the chance of battery failure and ensure ample electrical power is to is to add a second battery.įor example, 2011 Chevy/GMC 1500s come with a single Group 48 battery located in the passenger’s-side rear corner of the engine bay. (Most 3/4- and 1-tons run dual batteries from the factory.) Batteries don’t like cold, which leads to older, weaker batteries failing in the winter.īatteries get their hardest electrical hits during the winter months when auxiliary lights, the heater, radios, warning strobes, winches, inverters and other necessary accessories are being used during the commute and on the jobsite.Įven 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 1/2-ton pickups. One mechanical area that’s particularly suseceptible to cold is a pickup’s battery. Working outdoors in the winter is a taxing time in most parts of the country where weather takes its toll on both man and machine. Odyssey and Cole Hersee make it easy to add a second battery to Chevy/GMC 1500s It should as GM already had a second battery in this location for some applications. The finished auxiliary battery installation looks every bit OEM. Install longer 8x1.25x25mm bolts to hold the 175-amp circuit breaker to accommodates the additional battery cable that connects the cranking battery to the new auxiliary battery. A good location is the open threaded hole just below the alternator bracket. The main ground cable from the auxiliary battery should connect to the engine block. battery from the main battery depending on each battery's charge. GM battery retainer bolts into the existing battery tray, firmly holding the Odyssey in place.ĬOle Hersee Smart Battery Isolator (#48530) automatically connects/disconnects the aux. It costs less than $5 from the local GM dealer. The only GM part needed for the installation is this special battery retainer. The Odyssey battery sits fine in the existing GM battery tray. Don't wory about any acid spills-the absorbed glass mat (AGM) design is spill- and leak-proof. Lift and set the Odyssey battery into position. We choose the Odyssey 78-PC1500 AGM battery because it's designed for deep-cycling and to withstand hard off-road abuse.Ĭable extension posts allow multiple electrical components to be connected to the battery. It's put back after the battery and isolator are in place. The GM 1500 driver's-sdie fender brace must be unbolted to drop in the auxiliary battery.
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