Ford class A chassis Owner's Manual page 159

Circuit Breakers
If you need to check a circuit breaker that is on
the fuse panel, locate the circuit breaker
according to the instructions on the charts given
earlier in this chapter.
Since you need diagnostic equipment to check
whether a circuit breaker works and such
equipment comes with instructions, we do not
discuss how to check circuit breakers.
However, you should know that the circuit
breakers will reset themselves and allow the
electrical parts to work again once the overload
on the circuit is removed. If the circuit breakers
continue to cut off electricity, have your vehicle's
electrical system checked.
If you replace a circuit breaker, use one with the
same amperage rating. To remove a circuit
breaker mounted in the fuse panel, grip it with
your finger and thumb and pull it straight out
of its socket.
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