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Author Topic:   Tachometer Problem
wleavelle posted 03-26-2007 03:05 PM ET (US)   Profile for wleavelle   Send Email to wleavelle  
When I turn on my 1999 Mercury 200-HP outboard the tachometer initialially goes up to 1000-RPM then goes back to zero. [Seeks] suggestions.


padrefigure posted 04-01-2007 01:07 PM ET (US)     Profile for padrefigure  Send Email to padrefigure     
On an OMC this would be a sign of voltage regulator problems. Don't know if the same applies to Mercury.
Mister S posted 04-08-2007 12:36 PM ET (US)     Profile for Mister S    
If the 1999 electrical system is set up the same as 1994 and other years... the gray wire from one of the 2 regulator / rectifiers sends the signal to the tach. The other one has a plug on it. I'd swap rectifiers (only because I'm not sure you can just switch the tach leads)and see if tach works. Also check charging voltage both ways. If tach still n.g and voltage is good then I'd suspect tach. If tach works then the rectifier is n.g.

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