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rollexx's avatar
rollexx
Explorer
Apr 29, 2017

Battery disconnect

Picked up a battery disconnect for our fifth wheel. It's the paddle type that connects to
the negative battery post. Our trailer has two 12V batteries wired together.
I asked the guy at camping world if by installing this switch on one battery would it cut both batteries off. He said yes.
Well after installing I still get 12V power to 12V systems. Can only get power off by disconnecting a wire on second battery. Do I really need a switch for both batteries or am I doing something wrong? Thanks
  • DrewE's avatar
    DrewE
    Explorer II
    Apr 29, 2017
    Assuming you have a jumper between the batteries, and then a wire from one of the batteries to the trailer ground (which would be the most common setup), you'd put the switch on the battery with two connections with the ground connection to the trailer on one side and the battery post and the jumper to the other battery on the other side. The connection between the batteries remains connected all the time, but the connection between them and the trailer is switched.

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