Buick Enclave Trailer Wiring | etrailer Trailer Wiring Harness Installation - 2009 Buick Enclave. Today on this 2009 Buick Enclave we will be installing wiring harness part number 118450. The connection points for our wiring harness are located directly behind the tail light assemblies on both of the drivers and passengers sides. buick enclave wire harness | eBay Find great deals on eBay for buick enclave wire harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. 2009 Buick Enclave Door Wiring Harness Wire Assembly Front RH Passenger Side OEM (Fits: Buick Enclave) Pre-Owned. $94. Buy It Now. Free Shipping. Only 1 left!