On my last boating trip, a spark plug wire kept coming off the spark plug due to vibration. I would turn off the motor, plug the wire back in, and start the engine back up. After doing this about 5 times, the motor would no longer start. The motor turns over, but it is obvious that no juice is getting to the plugs. I've checked all fuses, etc and can't find the cause. Any help with this problem is appreciated.