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Can you say cave man?
Most times when I get a truck the tail light harness has usually been butchered beyond repair. I cut it up near the fire wall. I run new trailer wire back, I use the 8 / 1 black wire. That covers the stock 4 wires, plus a ground, power for a trailer plug, a wire for auxiliary back up lights on a switch, plus a spare. I also install a junction box on the rear cross member. Similar to this one.http://www.autoaccessconnect.com/12vowijubox.html