After 1 + hr run in rough water, 2500 rpm at times, got to the dock, tied up before loading onto trailer to wait for tide to come in alittle. About 45 min. later went to start motors. Turned starboard key and fired right up. Turned port key and heard nothing. Shut down other motor then tried to start the port one. I turned the key heard a click and that was it. Motor did not crank. I loaded onto trailer with other motor.

Any thoughts as to why motor locked up. They are procharged 502s. I did notice water dump for one intercooler had much less flow than normal, but engine temp did not change.

Any help is appreciated. Thanks

Try the parallel switch. Maybe you dropped a plate in the battery. That would kill the battery. Were they the marine type HD type?

Take out the plugs and see if there is gas or water in the cylinders.

I think the floats are too high in the carb. When hitting big water the motors will flood for a moment then clear. I pulled 2 plugs and they are both wet(gas). Pulled one on the other motor it was also wet. Both ran great all day.