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Dual bettery isolator QUESTIION

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  • Dual bettery isolator QUESTIION

    the wire to the second battery does it matter how long it is would it still charge right if the 2nd battery was in the trunk

  • #2
    Keep it as short as possible. Heat/fire is your #1 enemy in running a hot-wire to the trunk. Depending on your alternator and how much you are going to discharge your aux battery, you might need anywhere from 0 gauge to 8 gauge power-wire. Put in a fuse between the output of the isolator to the second battery, within 6" of the isolator, and you should be okay.

    Hope this helps.

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    • #3
      thanks alot

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      • #4
        Actually I would go one step further. Fuse the secondary battery within a few inches also, so no matter if the main wire shorts, the batteries are both protected. Two fuses are cheaper than a fire any day!
        2005 Ford Focus ST

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