Circuit Breaker Test

Locate 20-amp circuit breaker in fuse box. Move circuit breaker for access to terminals, while maintaining proper electrical connection. Connect negative voltmeter lead to ground. With positive lead, check each terminal of circuit breaker for voltage.
If battery voltage exists at both terminals, circuit breaker is good. If battery voltage exists at only one terminal, circuit breaker is defective. Replace circuit breaker. If battery voltage does not exist at either terminal, check for open or shorted circuit to fuse box. Repair as necessary.