'93 Force 90hp Kill switch wire question (no spark)- black/yellow seems to be grounding somewhere...

I've been trying to restore spark to my force 90. It sat for a year- ran fine when I stored it- now zero spark.
I ran some tests on the wiring and found that the black/yellow (from kill switch) seems to be grounded regardless of kill switch position/status. Just to make sure I have this right, when the blck/y wire from the kill switch to the switch box is grounded it kills ignition, yes? If this is correct, then if I disconnect the blck/y wire from the switch box ('ungrouding' it), then I should be seeing a spark right?
I am getting power from the stator to the switch box while cranking. All three coils are not firing, so they're ruled out for now.

Ideas?
Thank you

If this is correct, then if I disconnect the blck/y wire from the switch box ('ungrouding' it), then I should be seeing a spark right?

Click to expand...

Yep....

..so the switch box perhaps- or maybe the rectifier? Mercs are def not my specialty. Guidance on the next diagnostic step?
Thanks

If there's a tilt stop switch on that, disconnect it and throw it away. If not, rewire from the switch box to the harness plug.

I had a Merc that did this. Never found out where the short to ground was, but I eliminated it this way.

Jeff

I will look for it. Thank you.