Toyota Tundra Trailer Wiring | etrailer Trailer Wiring Harness Installation - 2002 Toyota Tundra. Today on this 2002 Toyota Tundra, we're going to install part number C55378. This is a Curt T-connector vehicle wiring harness with a 4-pole flat trailer connector. Toyota Tundra Trailer Wiring Harness | Advance Auto Parts Your Toyota Tundra will be happy to know that the search for the right Trailer Wiring Harness products you’ve been looking for is over! Advance Auto Parts has 11 different Trailer Wiring Harness for your vehicle, ready for shipping or in-store pick up.