Emergency kill circuit ?

[Joker2]

Question for my nightmare troubleshooting problem, already lost 3 weeks with the boat, here goes: I have a 1994 150 HP Ocean Pro, I have no spark on motor, when I disconnect the 1 pin amphenol style connector on the black / yellow wire ( kill circuit ) back by the power pack the engine starts and runs fine. Changed kill switch and ignition switch, I get same results, is it possible that the power pack or the stator could be bad or is it definitely in the wiring of the kill circuit ? Thanks for the help.