Dave's colleagues came aboard for our first party at sea. We got the sails up, but when we shutdown the engine, we topped out at 1.7 knots. None the less, everyone enjoyed motoring past the Seattle skyline. However, when Dave went to turn off the engine, the stop button did nothing. So Dave couldn't shut the engine down. I looked around to see if anyone seemed worried. But no, I should have know that all of Dave's colleagues would know of his MacGyver like abilities. Dave just hot wired the engine to shut it off. Later it turned out that a circuit breaker had failed in the open position. The circuit breaker has been replaced and the spare kit now contains another.