The GM HEI ignition system consists of several components, including the ignition coil, distributor, module, and wiring harness. The wiring diagram provides a visual representation of how these components are connected and the flow of electrical current through the system.. Learn how to wire your GM HEI distributor and coil with this step-by-step diagram. Improve your engine performance with the right wiring setup.
![[DIAGRAM] 5 Pin Gm Hei Ignition Module Wiring Diagram](http://gpzweb.s3-website-us-east-1.amazonaws.com/Ignition/HeiModules/Hei7pinDiagram.gif "[DIAGRAM] 5 Pin Gm Hei Ignition Module Wiring Diagram")
![[DIAGRAM] 5 Pin Gm Hei Ignition Module Wiring Diagram](https://images.msdperformance.com/blog_diagrams_and_drawings_6_series_hei_dual_connector_hei_module.jpg "[DIAGRAM] 5 Pin Gm Hei Ignition Module Wiring Diagram")
![[DIAGRAM] Gm Hei 4 Pin Ignition Module Wiring Diagram](http://www.useasydocs.com/details/HEI_wiring.gif "[DIAGRAM] Gm Hei 4 Pin Ignition Module Wiring Diagram")
![[DIAGRAM] Gm Hei 4 Pin Ignition Module Wiring Diagram](http://gpzweb.s3-website-us-east-1.amazonaws.com/Ignition/GPZheiModBenchTest.GIF "[DIAGRAM] Gm Hei 4 Pin Ignition Module Wiring Diagram")
![[DIAGRAM] Gm Hei 4 Pin Ignition Module Wiring Diagram](http://gpzweb.s3-website-us-east-1.amazonaws.com/Ignition/GPZheiMod.gif "[DIAGRAM] Gm Hei 4 Pin Ignition Module Wiring Diagram")
Connect the ignition coil negative (-) terminal to the [C] terminal on the module. For competition pulling - if the grounding-type killswitch is used, connect the ungrounded wire from the killswitch to this terminal.. Learn how to wire a GM HEI distributor and coil with this detailed wiring diagram. Improve your vehicle's ignition system today.