Check your tow bar and trailer brake light wiring. It may be grounded. I had this problem with my 92 roadmaster wagon. Tom.
The Buick Roadmaster was not produced in 1986. They were made from 1991 to 1996.
A 1992 Buick does not have an inertia or fuel cut off switch.
It is not equipped with an inertia switch.
If the fuse keeps blowing, there is a short somewhere. Since the dash and tail lights both go through the headlight switch, I would check the wires from the switch connection all the way to the tail lights, and the dash lights. Somewhere, a wire is crushed to ground or something like that. Make sure your switch is property connected and is a good switch! Good luck!
Sounds like it's not your bulb that is bad. It may be your brake switch isn't working.
Low freon
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