I have a 2001 malibu response lx with the hammerhead engine. For some reason our battery isn't charging right. When we put the boat in the water, the battery seems to be charging just fine (12.5 on PP and over 13 on the gauge). After riding all day, the voltage drops to about 11.9 on PP and under 12 on the gauge. We have a fairly new blue top optima battery, so I dont think the battery is bad. Is it possible that our alternator stops working after it gets hot, possibly a bad alternator? I have checked all the connections on the battery, and I have sanded off the terminals on the alternator to make sure of a solid connection. Any other thoughts on what it could be. I forgot to mention that the stereo is unplugged and we don't use any accessories while running the boat to help troubleshoot the problem.
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