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A 3-pin box can be tested fairly simply; remove the 3-pin connector and run individual wires to it. Pin B (center) is +12 volts, Run a wire from pin A to the coil (the other side of the coil is GND) and then hook a wire to pin C. Connect a spark plug to the output wire of the coil via a high voltage cable and ground the spark plug.
Once you provide +12 volts to pin B of the box you should hear the 3kHz whining noise. Once you touch the wire from pin C to GND you should see a spark being generated.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
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