GM HEI Module Wiring Pinout for Mazda Ignition Swap - Pins W, G, B, C Diagram

This is an annotated photograph (not a traditional schematic) showing how to wire a GM-style 4-pin HEI ignition control module for an ignition conversion/retrofit. The white HEI module is shown with blue crimp-on female spade connectors attached to its four terminals, and yellow callout boxes with red leader lines identify each connection: pin "W" (along with the module mounting hole) goes to a good ground point; pin "C" goes to the Yellow/Black splice (IG-); pin "G" goes to the Blue/Orange wire, which is the ignition trigger; and pin "B" goes to the Black/Pink splice for power. The wire colors visible in the photo include black (ground), green, red, and white leads. The module sits on top of a printed factory wiring diagram page, of which only fragments are legible, including a note that reads approximately "Directs voltage to spark plugs determined by engine speed." A reader can learn the exact pin-to-wire mapping needed to install this HEI module into a vehicle harness that uses Yellow/Black (IG-), Blue/Orange (trigger), and Black/Pink (power) wire splices — colors consistent with a Mazda ignition circuit, matching the uploader's 1995 Mazda 626 attribution, though the document itself states no year or model.