RPM gauge not working over idle speed 1997 50HP Johnson

merc20076

Petty Officer 2nd Class
Joined
Sep 9, 2009
Messages
156
It's been a while I did write here on Iboats! Well, I do not have my old boat with the old Lark VIII anymore, it was time for me to get a real aluminum fishing boat. What a real difference!

Ok now I just have a little problem, my rpm gauge works only at idle speeds. Once I give more throttle it goes back to 0. What could be the problem?. At the bottom of the gauge, I have 4 lights, low oil, no oil, engine hot, and check engine, they go on for a few seconds when I start the outboard.

The outboard is a Johnson 50HP 1997
 
Joined
Oct 22, 2007
Messages
2,598
Re: RPM gauge not working over idle speed 1997 50HP Johnson

Most of the time when a tach acts like that it's because of a bad rectifier/regulator.
 
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