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  1. #1

    Default 2nd battery in my 08 silverado 1500

    How do i install a 2nd battery isolated from the main battery and charge both with one alternator

  2. #2


    You pretty much answered your own question. You would need a battery isolator. Hellroaring's isolators are pretty popular in the offroad world, though they can be a bit pricy. The featureset on them, particularly the manual override/"self jumpstart" is awesome.

    The positives from each battery would go to lugs on the isolator, and so would the alternator. When 12v key-on voltage is put into a terminal on the isolator, it bridges the batteries together so they can charge. When that voltage it pulled off, it separates the alternator, and each battery.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

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  3. #3
    Dave V. -- Riverside, California
    Owner of --
    2008 Chevrolet Silverado 1500 4.8Liter V8 engine 2WD w/Kenwood Double DIN CD/DVD Player
    1971 Chevrolet Chevelle 350ci V8 engine with 500+ horsepower (Still Under Construction)

  4. #4
    Sr. Apprentice Steban's Avatar
    Join Date
    Nov 2008
    san diego, ca


    Adding an extra battery has been awsome when u battery dies in the desert.

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