:banghead:
I have 3 F-150 trucks from 90-92 all three have the same thing wrong If u put a fuse in the #8 (25 amp)(dome, radio, power mirrors, speedometer) it blows with or without the key on. Is this a comon problem?

I've taken out all bulbs for dome lihgts,disconnected the power windows,unhooked the speedo sensor, and took out the radio, and checked all wires I could find.Where to go next?

Both of my 92's only blow fuses about once a week, and my 90 u can't even but a fuse in without blowing.

I had the same problem with my 92 F150.

Disconnected the warning buzzer under the dash.
(Hated it anyway), problem solved.