im working on an '88 mercruiser 3.7 and it is having serious electrical issues. when a battery is hooked up, everything seems fine, but when the engine is cranked over it cranks slow or barely at all, even with a fully charged battery, and when its cranked the battery cables and the terminal begin to heat up quickly. it seems like it's a short somewhere but I can't find it and I have no other wires but bare essentials hooked up.. im think that it could be the built in generator/alternator because it's pretty much the only other thing hooked up... anybody have this problem before or know anymore???