I have a 1986 F150. Suddenly, the turn signals don't work. Neither does the emergency flashers or the brake lights. I've replaced every outside light on the truck, with no change.

What's going on?

 

I assume you've checked the fuses? Quick to do and 9 times out of 10, that's the issue....esp with an older vehicle.....

Fusebox should be under driver dash, just pull cover off and pull each fuse out one at a time and check connection in middle to see if blackened or seperated. If so, it's blown, go to Autozone or any auto place and get same power fuse and replace. They only couple bucks....

 

The problem persists.

 

Try this site, www.ebscohost.com
User: greatfalls
Pass: publiclibrary

Select auto repair, year, model, ect.

 

There is one thing in common with all those problems, everything goes through the multi-function switch. That is the turn signal switch, so it probably is bad.