[Aurel]

I need help troubleshooting a no spark issue on my 911sc (1978)

I have an MSD street fire that gets power and produces sparks when triggered by grounding the white wire.

But I get no sparks at the plugs when cranking, so I assume something is wrong with the distributor.

There is one spark when I turn the key on and, but no more sparks while cranking.

The coil is good, I have another good spare one and I get the same issue with both coils.

The rotor is a no resistor type that MSD recommends, so I know I don’t have a burnt resistor issue in the rotor.

I recently replaced the green wire to the distributor, so I know that is not the issue either, and I just checked its continuity is good.

This leaves me wondering what is behind the green wire that generates the spark trigger signal to the CDI box, and could that have failed? I do not know the details of the distributor trigger mechanism, I am assuming it is magnetic but wondering if there are known parts that can fail and cause a no spark situation.