Description: Designed to Work Wwith the Existing Electrical System, This Harness Features a 7-Pin Connector on the Trailer Hitch to Power Your Trailer’s Taillights, Turn and Brake Lights. Towing Options- 7 Pin Wire Harness. Designed to work with the existing electrical system- this harness features a 7-pin connector on the trailer hitch to power your trailers taillights- turn and brake lights. Complete with converter assembly- fusing- cables and connectors- it offers reliable performance and simple installation.