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Thread: Dual bettery isolator QUESTIION

  1. #1
    Join Date
    Apr 2004

    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. #2
    Constant Bitrate
    Join Date
    May 2004
    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.

  3. #3
    Join Date
    Apr 2004
    thanks alot

  4. #4
    FLA gospeed.racer's Avatar
    Join Date
    Dec 2003
    Portland, OR
    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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