2nd battery in my 08 silverado 1500

Discussion in 'GM Electrical Tech' started by chevy68, Oct 14, 2011.

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  1. chevy68

    chevy68 New Member

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

    Crawdaddy Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    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.
  3. hotrodking86

    hotrodking86 New Member 100 Posts

  4. Steban

    Steban New Member

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

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