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Mercury 225 Optimax Tachometer Problem

Coach Keith

New member
My tach suddenly started reading wrong (high). Nothing was touched, but it had not been used for a couple of months. Says 3500-4000 at idle and goes up to 8000 running. It is not really doing those RPMs. Coincidently my battery went bad. Does the charging system/stator/regulator also control the tach? Any simple fixes?
 
I had a similiar problem with a 150 Mariner. The voltage regulators were bad. The had shorted out at a connection and fried the regulators. Can't remember what the repair cost was. You may be able to do it yourself if you know about testing electrical stuff...BF
 
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