I've got an '87 F250.

My head, parking, and tail lights all went out at the same time, and I've run into a problem in trying to fix it. I have power to the switch as I should. The switch itself tests out okay. When I use a jumper at the switch connector, I get no lights. Now, I can find no place where the circuits (head and parking) come together that would cause all these lights to fail.

Can someone with experience in working with this give me an idea of what I'm missing and what I might check? I hate to start running new wire if it isn't necessary to do so, but I need the truck.

Thanks

 

Blown fuse maybe? Or switch? U said u tried it without the switch right?

 

I bet the connector at the switch is melted.

 

I'll check the connector again even though it looks okay. When I use a jumper wire from the battery power slots to either the head or tail lights slots, I get no lights. I do get power as far as the dimmer switch. Any more suggestions will be appreciated. Thanks.

 

Here's a link to how to properly test the head light switch. I would think that if all 3 were not working the switch would be my 1st guess. Hope it helps.

Part 1 -How to Test the Ford Headlight Switch

 

Headlights are on a circuit separate from all other lighting, common only at the headlight switch. Dome and instrument lighting still work? Other electrical items in the cab? Checked the body to frame grounds?