[PDF] Including 3- and 4-Port Isolation Modules with 2- and 3 and revision level. Early 9-pin harness revisions 1–9 and 12-pin harness revisions 1–7 have a ground circuit in which the control, motor relay, and headlamp relays all ground through the 9- or 12-pin connector. Some of these early revision harnesses also have a diode in the ground wire to the headlamp relays. Complete 9- and 12-pin Related searches for 12 pin wiring diagram 5 wire relay wiring diagram3 wire headlight wiring diagramuniversal wiring harness diagramhow relays work and wiring diagrampainless 12 circuit wiring diagram12v generator wiring diagram6 volt generator wiring diagram5 pin automotive relay diagram