Battery disconnect wiring
On the house batteries, do you break the positive or negative on the disconnect. Am seeing it done both ways?
Forum Discussion
Electrically it doesn't matter; an open in the circuit is an open in the circuit. Sometimes one or the other is easier to do (say because there are multiple positives going to the battery but only one negative).
For a trailer, I would take care to ensure that the breakaway braking system is not disconnected by any battery disconnect switch. It does not use any power unless activated. That very likely means putting the disconnect in the positive circuit, with the connection for the breakaway brakes on the battery side of the disconnect. There may be a few other loads that you also want to not be switched--such as the power for the disconnect solenoid, if you use a latching solenoid switch for that purpose, or a solar controller.
For a trailer, I would take care to ensure that the breakaway braking system is not disconnected by any battery disconnect switch. It does not use any power unless activated. That very likely means putting the disconnect in the positive circuit, with the connection for the breakaway brakes on the battery side of the disconnect. There may be a few other loads that you also want to not be switched--such as the power for the disconnect solenoid, if you use a latching solenoid switch for that purpose, or a solar controller.
