Handbook 652 Body Electrical Diagnosis Wire Harness Connectors A connector joining wire harness to wire harness, also called a harness-to- harness connector, is located between harnesses, and is identified by a white rectangular box. The ID number for harness connectors is listed in the box and is cross referenced at the end of the system circuit diagram. This points to the page in Electrical Wiring Routing section showing the connector location. 84 Technical Training