How to Wire a Battery Cut Off Switch

Whether it's to preserve a battery for long-term parking or to help deter car thieves, a battery cut-off switch is a convenient feature for any vehicle. By interrupting the flow of current from the battery to the vehicle, a cut-off switch will help prevent loss of cranking amps while the car, boat or RV is parked. It also makes it difficult for anyone but the owner to start the vehicle. With some basic tools and a little preparation, you can install a cut-off switch.

• 1

  Disconnect the negative battery cable with an open-ended wrench.

• 2

  Clean the negative battery post with the wire brush.

• 3

  Attach the cut-off switch to the negative battery post then attach the negative battery cable to the terminal on the cut-off switch. Turn the switch to the "On" position. Test the vehicle for power; if there is no power, check the connections and fuses.

• 4

  Turn the switch to the "Off" position and verify that power to the vehicle is disconnected. Return the switch to the "On" position.