I Have A 1986 F150 And The Brake Lights Wont Come On. I've Changed The Bulbs And The Brakelight Switch Any Have Any Ideas.

 

Fuse?

 

Does your 86 have the high mount stop light? If so, does it work?

If you have it and it works, the problem would be in the multi-function switch.

If you don't have the high mount stop lamp, it still might be the MFS.

Steve

 

I don't think an 86 HAS a multifunction switch. I believe an 86 still had a dedicated turn signal switch.

Without seeing the schematics, I can't say, but 20 minutes with a test light should make the problem readily obvious.

-Joe