Is melting of the dash switch and or plug from the wiring harness a.common problem. I have 1994 f350 that I got and smelled burning wire type smell off and on. I was finally able to tell it was coming from the light switch. When I took it out the plug from throw harness and wires behinfd it were melted. There was shrink wrap and you could tell that the plug was replaced at some point. I was going to go to the bone ward and cut a plug out and was curious if this is a common problem and if there is a fix.