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dual battery bank switch question

Discussion in 'The Projects Forum' started by aac9876, Mar 5, 2008.

  1. aac9876

    Thread Starter Active Member

    Dec 9, 2006
    this is a switch used to switch back and forth between 12v battery banks,deep cycle. they are used on boats and house solar systems when there are 2 different types of batteries or older/newer batteries. the top 2 lugs are for the hot leads to each battery bank. the bottom lug is labeled common.
    I have run into this before and I'm not sure why this confuses me but........ what wire goes on the common..?? the black neg.
    wire from each bank..?? or just a wire to ground, like a wire to
    the grounding rod on a house or the chassis of a motor.??
    could you provide diagram..??thanks..
    my thinking was just run a suitable size wire to the chassis/motor mount from this common bolt..:confused:
    now I find out it wont take a jpeg more than 244 kb.
    skip the photo ,you can prob. figure what I mean.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    If you have a meter, you can use it and see that the switch common connects to the top lugs, one at a time. You use it to switch a bank of batteries to the load, whatever that is. Those black wires are from the battery negative terminals. They should be tied together and go to the chassis.
  3. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    If I read you correctly, it would be as in the attached: