my grandfater passed away a few months ago and I found a 65hp Merc in his shop. I don't know what's wrong with it but I seem to remember him saying he bought it for the lower unit. It's all there, just wondering where to start? It looks like the battery cables are melted?! How can I test a motor this large? I have a 55g drum for my smaller Johnsons but I don't even know where to start on this large a motor.