Switch room's circuit breaker to ON position.

Turn light switch on and repeat step 5.

Shock Hazard. Electricity should now running through wires. Only touch wires with multimeter leads.

Make sure multimeter reads between 110-125 volts.

If the measured voltage is not between 110-125 volts, do not continue. Contact a qualified electrician for further service.

Turn off light switch.

Change room's circuit breaker to OFF position.