Ford MUSTANG Manual page 148

Since the circuit breaker for the headlamps is
mounted in the headlamp switch, you must
replace the entire switch to install a new circuit
breaker.
Lights and Bulb Replacement
It is a good idea to check the operation of the
following lights frequently:
headlamps
tail lamps
brakelamps
hazard flasher
high-mount brakelamp
turn signals
license plate lamp
fog lamps (GT and Cobra models)
The alignment of your headlamps should be
checked if:
oncoming motorists frequently signal you to
turn off your vehicle's high beams when you
do not have the high beams on
the headlamps do not seem to give you
enough light to see clearly at night
the headlamp beams are pointed substantially
away from a position slightly down and to
the right
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