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My 1988, DT140 seems to be overcharging. The voltage gauge is running around 15V at any mid range rpm. Then it blows the 25A fuse (one of 2) that is in the CDI enclosure area, next to the CDI unit. After this reoccurring fuse blowing issue, I purchased a used rectifier and voltage regulator/rectifier to test the voltage problem. I was told it was in working condition. Not sure if they are as I don't know how to th? I installed them and same problem, blowing the one 25A fuse. This fuse is the one that has a white with red stripped wire on both ends. It goes to the down side of the tilt/trim relay on one end of the wire and to the ignition switch (ON and START part of switch) on the other. The tilt works fine until the fuse blows. The other 25A fuse that is next to the one that blows never has blown. That fuse is the one that actually goes to the voltage/rectifier and rectifier (white wire). Do you know what the max. voltage needs to be at a fairly high rpm? It seems that the thing never ran above 13 volts or so before. Any new ideas???