Bad battery connection led to pull-starting to get home(10 minutes at idle). Did not realize battery switch was off until reaching dock and first buzzer indication. Batteries are new, disassembled and cleaned battery switch and all cables, replaced water pump, checked and cleaned themostats(no corrosion), both oil reservoures full, engine tank sensor appears to operate normally as I removed partially from tank, buzzer works properly when attempting to start with kill switch activated. Motor has approx 500 hours, barely spec of corrosion anywhere.