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Tachometer output on 50 Hp Mercury four stroke
Model year 2000, Mercury 50 Hp, fourstroke, "Big Foot". Carbureted engine. My troubles with these engine never seems to cease. Finally got the motors running half way decent, but now the tachometer for one engine has stopped working. I swapped wires at the helm station between port and starboard engines and the problem followed the engine, the tach works fine. I have an after market manual on the engine that provides a wiring diagram but I can't figure out what the tach output is. There isn't a whole lot to the electronics (except big and probably expensive modules). The engine runs fine, but I suspect that the charging circuit is a little weak. With the engine rev'ed up fairly high I was getting 13.0 volts at the battery (pretty close to fully charged, it was at 12.7 before I started the engine) so I am getting at least some charge. I am not too concerned about the rate of charge but I suspect that the tachometer output might be related to the charging circuit. Can anyone give me a guess as to what I need to change to make this thing work? I really need the tach. I can't really hear the engines from the helm station (houseboat) and without the tach I can't tell if the engines are anywhere close to running the same. Rod |
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