Turning Off Light Switch Trips Breaker . The problem will be at the switch or the light, or to a lesser possibility in the wire between. Unplug electrical appliances that are not in use. electrical Circuit breaker trips when ANY light switch on the circuit from diy.stackexchange.com First, the circuit breaker’s black wire connects to the white wire and other black. If this started all of a sudden, with no removal of switches or fixtures, i would suspect a problem at the light fixture. Taking off each switch one at a time may find the problem.