I suspect someone installed the wrong lamp in your aircraft. Many
14volt 172's use a par36, 4509 lamp which is rated at 13 volts, 100
watts, 7.7amps.

You need to look up in the parts list for the aircraft the correct
part number of the lamp.

I did look at the parts manual and it states GE 4522 and the breaker is a 20
amp.
Would a 4509 or 4905 fit in the same housing?
Hank