1994 Ocean Pro 150 - the tach is intermittent, very rarely works but will pop on here and there, and I'm getting about identical 12.4xv while idling and off, then around 10.8-11.2 while under way with the sonar and stereo running. I'm thinking both stator and regulator/rectifier. Not seeing test procedures in my OMC manual. Is there anything I can do here aside from throwing parts at it, or are those two symptoms just certain enough?
I have a spare tach that I tested at the helm end with jumpers off the control wiring and it bumps up when the signal wire first hits it, then back to zero and stays there.
I have a spare tach that I tested at the helm end with jumpers off the control wiring and it bumps up when the signal wire first hits it, then back to zero and stays there.