I'm not sure where to post this.

I have a 1987 xr2 black max 150 when I came back to the boat ramp yesterday  the motor wouldn't turn I tried pulling the kill switch and still wouldn't turn off.

Does anyone knon where I should start digging. I'm thinking it's a ground issue but not real sure. Any insight is appreciated. 

When my old runabout had that issue (40HP Johnson) it was the starter coil.

Just to be clear, your saying it wont turn "off", right?

 

If yes, then I imagine the ignition gets grounded somehow to shut down the motor.  Tha's how my old Merc works anyway.  If the key can't find ground because of a broken wire or similar, the kill switch probably uses the same wire, causing it to do what you are describing.

 

I would try to find a schematic for your motor, and controller.  Then go from there, testing continuity on the proper wire.

Yeah I'm thinking it's  a ground  issue also. I'm going  to see if I can find the problem this weekend.