[Michael C Henry]

You can break the circuit any place you desire.If you put it on the negative side and it is not bypassed for items like the alarm it is as absolute as the positive would be. The up side for the neg is if you inadvertantly short it nothing happens .No sparks or great arks. Then the positive side is supposed to be routed through switches before going on to the devices and evntually to ground and back to battery.