Emergency kill circuit ?

[Joker2]

OK today I went down and followed some tests given by CDI. First I checked spark. I have no spark on the Port side of motor, even with the black yellow wire ( kill circuit ) pulled apart. Explains why engine was starting but running bad ( only 3 cyl. ) Now I feel it is not the kill circuit. I pull the 6 wire plug on the starboard side going into the powerepack. Crank it , Port side now has spark. They say if you get spark back to go ahead and check bl/yw and bl/ orange for a short to grnd. Did that it was OK. Then to check to see if the shift interupter switch is located in the circuit where there is no spark. I can't find anything about the shift interupter switch in my SELOC book. Any thoughts ?