To pa911, and others who don't have a clue about the operation of the Bosch CDI system:
CDI systems NEVER HAVE +12 Volts at the coil!!! One side of the coil is permanently grounded, and the other side gets intermittent, timed +460 Volt pulses from the CDI unit!
michigan,
To test the CDI system plug a spark plug wire directly into the coil and ground a new spark plug for testing purposes. Disconnect the Black and Black/Violet wires at the distributor and repeatedly touch the Black wire to ground. Each time the wire is lifted from ground there should be a blue/white spark at the test spark plug.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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