Buick Century Trailer Wiring | etrailer Trailer Wiring Harness Installation - 2000 Buick Century. Today on this 2000 Buick Century we are going to install part number 18252. To wire the vehicle up we are going to have to get to the back of the tail lights and the wire harness is ran up behind here and into the tail light. 2002 Buick Century Trailer Wiring | etrailer Call 800-298-8924 to get Expert Service ordering a Trailer Wiring for your 2002 Buick Century. Complete installation instructions and lifetime technical support on all Trailer Wiring purchases. Lowest price guarantee on accessories for your Buick Century and the fastest shipping available.