Quote:
Originally Posted by Pazuzu
Although, you said things don't change when the black wire is removed...
possible that you got a voltage spike somehow and you have an actual blown out tach? Internal damage?
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Could be. I can, however get the tach needle to bounce up, by tapping the TD terminal to ground.
Quote:
Originally Posted by Jonny H
Island,
Measure the voltage on the TD wire with ignition on, engine not running. Should be around 6.8 volts.
Now, measure the TD pin on the back of the tacho with the TD wire disconnected. Should be a little below battery voltage ~12v.
So if the wire is reconnected and you get ~12v it points to a broken TD wire. It you get 0v, probably means the CDI TD output is toast.
Cheers
Jonny
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Another really great post. --I read your description of how the tach ground-pulses thru the CDI, on another thread. (very useful)
I'm going off memory, from a few days ago, and remember ~6V off of the TD terminal (when bare). I'll check these again.