Re: Auxiliary Fuel Tanks in a C-20
The wiring harness you have pictured is to plug into a camper that fits into the bed so the camper lights will light up. Looks just like the one I pulled off the '71. If you follow it back up to the firewall you'll see it is a T plug that plugs into the rear light connector. My step dad's '71 had a taillight issue and was able to track it back to that harness shorting to ground, due to it just hanging under the truck.
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