willip, not sure how your engine is wired, but that doesn't sound correct. I can't see how the fuse in the cowl area blows and everything quits working. Sounds like somebody wired it up incorrectly. I would try to find a wiring schematic diagram for your engine and do the proper wiring and then address the boat wiring as well. Not know, or being there, it is hard to say where that mis-wired starts. But I would certainly change that before boating again... The fuse in the engine area should be connected from the battery positive side or the starter solenoid and goes to the key ignition switch (terminal listed as battery) to be used to power the engine up when turned on...not the entire boat accessories. Your wiring needs changed! JMHO!