Audi Q7 Trailer Wiring | etrailer Tekonsha Trailer Wiring Harness Installation - 2014 Audi Q7 Today we're gonna be installing Tekonsha's Heavy Duty ModuLite Vehicle Wiring Harness for your 2014 Audi Q7. This wiring harness is gonna provide you with all the necessary lighting that you'll need on your trailer to 2018 Audi Q7 Hitch Wiring | Harnesses, Adapters, Connectors Audi Q7 2018, Towing Wiring Harness by Westin®. Location: F. Electric System Type: 2-Wire System. This superior product is perfect to make your trailer towing experience safe and convenient. Designed to meet the highest quality..