Hi,
I have a
Yanmar 3ym20
motor in my
Beneteau First 31.7. The tachometer went crazy, showing first full
RPM and after the next start zero RPMs. Also digital hour meter started blinking.
The tachometer is a VDO made unit, in a
Yanmar B Panel.
I first thought it must be a
wiring issue, or
alternator issue but then proved both assumptions were wrong. Finally I tried to change tachometer settings and that
solved the problem: now I get some near correct readings out of the tachometer and hour meter also works.
Now the problem is how to figure out correct pulses/round settings without any meter to show the
RPM?
Does anyone know how many pulses per revolution the standard Yanmar
alternator produces?
Or even better, what is the correct setting for this yanmar tachometer?
I don't have a clue how the tachometer
lost its settings. Does anyone have similar problems?
BR,
--Jussi