Circuit Breaker

Circuit breaker is located in wiper control switch on all rotary switches and in fuse panel for slide wiper control switches. On models with the circuit breaker located in the fuse panel, the rating is 7.5 amps. The circuit breaker integral with the switch is rated at 7 amps. The following test does not apply to vehicles with the circuit breaker located in the fuse panel. See Fig. 5. 

Fig 1: Circuit Breaker Test Does Not Apply To Fuse-Panel Mounted Circuit Breaker.

Courtesy of FORD MOTOR CO.

1. Before connecting tester leads as shown in Fig. 5  , short tester leads together and adjust current draw until it equals circuit breaker rating. Connect switch to tester and leave switch connected for 10 minutes.
2. Current reading should remain at rated current. If circuit breaker opens during the ten minutes, replace wiper switch assembly. Short tester leads together and adjust current draw until it is twice rated current.
3. Connect switch to tester and current reading on ammeter should drop to zero within 20 seconds. If it takes longer than 20 seconds for breaker to open, replace wiper switch assembly.