Emergency stop switch

[Joker2]

Changed ignition switch today, same result as last night, no spark, only difference is, just like the other day when I disconnect the black / yellow plug by the power pack she started up, she ran rough I could only keep it running by working the linkage, could be the seafoam I added to the gas last week, not sure. she would stall if I let it go. It would only shut off if I plugged it back in when it didn't stall. I think I will hook up a jumper from the black and yellow wire in the controlbox to the other side of the 1 pin plug by the power pack to see if that wire is shorting to ground somewhere from the control box to the engine. what do you think spareparts.

[spareparts]

first off, what year model, size, and brand of engine are we talking about/
Next, remove the main wiring harness plug from the engine, spin the motor over by connecting the yellow/red wire to red to activate the starter solenoid, you should have fire. Turn the key on(with the harness disconnected), check for continuity to ground on the black/yellow wire in the harness to ground, it should not have continuity to ground, if it does, you've got a wiring issue with the boat, not the engine

[Joker2]

1994 150 Ocean Pro, where do I put these wires together (jump across plug)?

[Joker2]

I understand what you mean about the bl /yw wire

[spareparts]

jump the yellow red to the red at the starter solenoid