re: After market lower unit outdrives
I took the lower cowling off the motor and found the interrupt switch below the shift and throttle linkage. Depressing the switch manually while the motor idled had no effect on RPM. New switch from internet
would cut spark to 3 cylinders dropping RPM and thus allowing shift back to neutral to occur. Thanks to BODEAN your info was right on, and you saved me $1000 in an unnecessary repair.
In a previous fun-fest working on the motor I discovered an in-line bladed type automotive fuse (20 amp) on the upper starboard side of the motor that is part of the starting system. If you have a "dead" key switch make sure to check this fuse first before replacing the switch.
I would locate and replace the fuse using dielectric grease just to make sure that corrosion doesn't ruin your day. Hope this helps someone else.