Ignition Woes! 1977 200 Horse Johnson

Thanks guys, In the trouble shooting section of the manual I didn't see anything about the shift interrupt switch but I wasn't really looking for it either. Where might it be hiding? By the throttle quadrant or the power head?

A couple of years ago when I pulled the boat of of storage, I ended up swapping the power packs because one wasn't working right. Don't remember which one but when I swapped them out they both ran fine so I figured it was just some corrosion that I cleaned off. Maybe it was a bad power pack and I just got lucky for a while.

Thanks,
Buenos