rickdb1,
I looked at a wiring diagram for a '48 as I couldn't find one for your '52. The '48 light switch has a small fuse on the back the protects everything on that circuit. That would mean if the headlights work, the taillights should be powered also.
Again, I don't know if your rig has fuses. I sort of thought there was a small fuse box near the voltage regulator on some of the rigs, but I don't know.
If your rig has the aftermarket dump bed, the only wiring diagram of relevance would be in the cab area. The order of the day would be to raise the box and block it up, then do a visual for busted or mashed wires down the frame rails.
The next step would be to use a meter and find out if you have power headed back to the lights from the switch. Somewhere you will have voltage, then you won't! This might be under the dash, but my bet is in the bed area or down the frame.
You could start at the lights, check for good lamps and grounded light assembles, then probe back toward the cab with your meter. Hopefully you will find a break.
If you actually have the small fuse on the light switch, and it does service both headlights and taillights, it must be intact for the headlights to work. This means you don't have a short going back to the rear...but maybe a 'open'.
If this post gets lost, check the Electrical forum. Good luck!
Stuart
