Handbook 652 Body Electrical Diagnosis Junction Connectors, Complex automotive wiring involves many points where wiring is joined or divided by junction connectors, harness connectors and splice points. Each of these points in a circuit offer opportunities for problems, and possibly convenient places for circuit testing. Harness Connectors and Splice Points Understanding how these connection points are represented in circuit diagrams, and how to find them in the vehicle can be essential to diagnosing some types of electrical problems. Junction Connectors A junction connector is a component with internal circuits for distributing current or ground.
It is much simpler than a junction block and performs the same function as a splice, but a junction connector is more reliable than a splice. As a component, it has component connectors identified by connector ID numbers above the component name in the system circuit diagram. The junction connector may distribute current for more than one circuit. The system circuit diagram shows only the part of the junction connector that affects that circuit. Because it is treated as a component, the procedure for finding its location and other part information is the same as for other components. Technical Training 81