Trailer Wiring Harness Installation - 2002 Toyota Tundra Sep 19, 2014How to Install a Trailer Wiring Harness on a 2002 Toyota Tundra. Today on this 2002 Toyota Tundra we're going to install part number C55378. This is the CURT t-connector wiring harness with the 4-pole flat trailer connector.5/5(38)Category: Custom Fit Vehicle WiringBrand: Curt 2002 Toyota Tundra Trailer Wire Harness and Connector Equip cars, trucks & SUVs with 2002 Toyota Tundra Trailer Wire Harness and Connector from AutoZone. Get Yours Today! We have the best products at the right price.