Sounds like you have a wire grounded out somewhere in the wiring, possibly going to the switch.
Find out why the fuse is blowing. You have a short or the circuit is overloaded.
There is an electrical short to ground in the fan switch or in the blower motor itself.
The 50 ampere engine fuses is blowing because more than 50 amperes of electricity is passing through it.
could be that the regulator in the alternate is failing and causing power surges in the electronics and the fuses are blowing to prevent damage to the device and vehicles wiring.
Ignition switches have a pattern of spades on the back side that must match the replacement switch exactly otherwise you could end up blowing fuses or frying a coil. Hope this helps.
The ignition fuses for the 1993 1993 Buick Regal 3800 is located on the car's dashboard.
There is a short somewhere.
there is a short somewhere in dash or heater, you need to fix that to stop fuses blowing
Are you blowing fuses or are the bulbs blowing? Blowing fuses would be a sign of any wires or metal contacts in your brake circuit grounding out or shorting on themselves. You'll have to check all of the wiring in your brake light/switch circuit to be sure.
Check switch
Your ground or power can be hooked up wrong....or the fuses might not be big enough...mine was having the same problem!
check your fuses check ignition switch