My 1973 F350 Camper Special (auto on column) recently decided not to turn over. I found the problem to be the actuating arm for the Neutral Safety/backup light switch. The arm had fallen or broken off. I removed the switch and have it fixed in the position for "Park" temporarily. I understand that the backup lights also work off this switch. Which wires are which?

Also, where would I get wiring diagrams for this truck?

Thanks,
Salty

 

I think they may have diagrams for a truck that old on this website. Click on the highlighted wiring diagrams and see what comes up.

 

Thanks..... wonder if Haynes would help?

 

Possibly. Also, with the key in run position, one of the wires will be hot. This is the feed for the back-up lights. And for years, Ford has used blue/red or red/blue(can't remember which) for the neutral start circuit. And the switch will have two of these the same color(one's in, the other is out to the starter).