I have a 2001 Regal 2960 cruiser with twin 5.0 mercs. Recently, both engines start without issue at the dock. I run 15-30 minutes and tie up with friends. When time to leave, the right engine won't "start". I turn the key, the gauges register power, but the starter doesn't turn. It's similar to an experience when you try to start and the throttle not in neutral. I've tried "everything" I can think of - try in throttle neutral, giggle the throttle, parallel power from battery, etc. I do not have "kill switch" lanyards. I returned to the dock several days later, and they both start. Take it out and same issue. Luckily, I have two engines and not too far from dock! Would love some insight if anyone has seen this before.