Helping my old Boss repair his boat. Crownline with a vovo V8 inboard/outboard when battery hooked up draws about 6-8 amps nothing turned on. I am electronics person disconnected Alternator thinking it might be draining battery, no help. Corrosion every where, guessing normal on boats. Main red battery terminal goes to starter and i dont see other DC wires other than alternator lead, assuming the rest of the DC is fed from motor wiring harness. I do not hear any pumps or fans running, all lights are out. My thinking is something drawing 7 amps is a normal load of some kind that is not shutting off. Any suggestions would be appreciated.