I have a 1978 mercruiser 470. I hooked the battery back up to it after it set over winter and tried giving it a start. The motor cranked slowly, as if battery needed to be charged (it has set all winter). I turned it over for about 6 seconds, then released the key. The motor continued to turn over, even after I removed the key completely. I ran to the battery to find the wires getting so hot that it melted the solder inside the connections. I undid the wing nuts and removed the connections as quickly as possible. The connections were correct, reds on positive, blacks on negative. I let it set a few minutes and upon touching the wires back to the terminals, it started to crank again so I removed them again and now here I am.....any ideas? The boat was parked last year and did not ever do this, please note that this is the first time ive tried starting this boat this year...thanx
