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    voltage problems, alternator upgrade?

    I have a 1977 mercury outboard 115 hp L6 and I just put in a pretty powerful stereo system. I took it out to the lake and the first day I had not really a problem but the second day the marine optima had enough. I dont think the motor is supplying enough juice to the battery, so what can I do...
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    question

    I'll try to take them out and clean and rebuild them so that I'm sure all is O.K. but thanks that is what I needed to know on the lake when I got stuck.<br /><br />I have been reading and studying a repair manual and found that maybe the motor I have is not 150 hp and is 115 hp. Im confused...
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    1977 mercury 150 hp inline six

    I just bought this boat and had the engine serviced. I took it to the lake and it ran for about 10 minutes and then it would start and idle with the engine warmer lever in the upright position. The minute I placed it in forward it would die. Then it would start and idle again but would not run...
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