We took our 1999 Mobius out of winter storage (winterized by professionals) and the boat started and ran just fine. A few days later, the electrics on the dash all worked, but when we tried to start it, the ignition did not engage and all of the power then died. We replaced the battery and encountered the exact same problem: all lights/blower would turn on but when the key was turned to start the engine, all electronics died and the boat would not start.

Any suggestions on what the problem is and how to solve?