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John at J&S John at J&S is offline
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Join Date: Dec 2005
Posts: 147
1) System ground

2) Switched 12v from key (for example, coil positive)

3) Aux: For twin plug version, connect to coil negative of one coil. Otherwise, this is a low current 12v tach output. Could be used to trigger the MSD "Points" wire.

4) Coil-: Coil negative. Must use this output for single coil systems. Dwell control software senses coil current from this coil.

5) DigIn: Logic level trigger (5v or 12v trigger is ok)

6) Pts: Points trigger

7) MagOut: Magnetic output trigger, could be used to trigger magnetic input wires on CDI systems.

8) StgLim: Staging rev limit is selected when 12v is applied.

9) NitRet: Nitrous retard is activated when 12v is applied.

10) MagIn+: Magnetic input trigger signal wire.

11) Gnd: Magnetic input trigger negative, knock sensor negative. Install second ground wire when driving two coils.

12) KnkSnsr: Signal wire from knock sensor.

At the selected limit, software fires three cylinders, skips two, and repeats the pattern. This cycles the misfiring cylinders, preventing plug fouling. If the engine goes 100 RPM above the selected limit, software skips as many cylinders as needed.

For 4, 5, and 8 cylinder operation, software fires two and skips one. Can't use this on a six cylinder, as it would skip the same two cylinders, fouling the plugs.

Pin 1 of the main connector is at the lower left of this photo.

Old 07-19-2008, 06:42 AM
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