How did you get the spark without triggering the HE pulseswitch?

Which CH ignition module do you have? Do you have the Synchro-Spark built in, or external?

It's possible that your pulse switch is bad, but unlikely. CH's tester is a good idea, IMO, to check all the wiring and the pulse switch.

Rather than calling BME, call Bill at CH about this. BME makes the engine and slaps on the ignition from CH.

Also, are you checking for spark from both leads?

Good luck,
Erich