MSD External Coil HEI Module Wiring Diagram - 1994 MX6 V6 Distributor Ignition

This is a hand-annotated wiring diagram titled "MSD External Coil HEI Module Diagram," created by user "bencollinz" on 1/28/05 for a 1994 MX6 V6. It shows how to wire an MSD Multiple Spark Discharge ignition box together with a GM-style HEI module and an external ignition coil to the vehicle's distributor harnesses. The factory 3-pin distributor harness wires are identified: yellow (not used), green, and black/white. A separate 6-pin distributor harness carries the distributor ignition input on the blue/orange wire. The MSD box's red, white, black, and orange wires are shown connecting through inline splices, with the white circuit passing through a 1,000-ohm 1-watt resistor to the HEI module, whose terminals (W, G, B, C, GND) are labeled. The MSD's heavy red and black leads go directly to the battery positive and negative terminals, and the tach output terminal is called out; the magnetic pickup connector is not used. The coil's + and − terminals are shown, and a sketch of a "modified disty cap" (distributor cap) illustrates where connections route into the distributor. The author notes the diagram was made purely for visual reference and shared for others' benefit.