I have installed a mechanical Hobbs hour meter to my Yanmar
4JH4E. I have connected to a ground and then ran the positive to the oil
pressure switch(is that the right term). I checked the switch and with the key on but not the engine
it had no voltage. When the engine
ran for a short time there was 12 plus volts. I assume this is a normally closed switch. There is only one wire to the switch.
I connected the hour meter switch to the threaded lug on the end of the switch. When I started the engine there was a low volume alarm
sound coming from the ignition panel and a louder sound that I could here every few seconds on a timed basis. When I disconnect the positive lead from the hour meter the noises go away. I never got the meter to register any time but not sure the engine ran long enough to clock time.
Did I wire it incorrectly? Any ideas?
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