Hi, I have a 1975 17' Searay with a Ford 302 and OMC 175 Stringer. Started up fine at the dock, ran it about 15 minutes and stopped to put a skier in the water. When I put it in neutral the engine died. Turned the key and nothing happened, engine didn't try to turn over, no power to the nav lights, blower, horn, etc. Another boat stopped to offer a jump start, initially there was clicking sound but wouldn't start. After second attempt and beyond no clicking sound and no electrical power to any part of the boat. Battery has a full charge. Could this be a solenoid assembly problem? I was probably going to start by replacing it. Any suggestions would be greatly appreciated? Thank you.