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Author Topic:   System Check Tachometer Malfunction
OCMDJack posted 08-16-2009 03:14 PM ET (US)   Profile for OCMDJack   Send Email to OCMDJack  
[Apparently in reference to an OMC System Check tachometer] Is there a correlation between LOW OIL signal and the tachometer? Or is [the sounding of an NO OIL alarm and the failure of the tachometer function on a OMC System Check tachometer] just a coincidence? I have plenty of oil, but the warning horn goes off and the [alarm annunciator] light stays illuminated. At the same time my tachometer quit working for my 2005 Johnson 50-HP.
seahorse posted 08-16-2009 04:45 PM ET (US)     Profile for seahorse  Send Email to seahorse     
If the needle does NOT go to zero when you turn the key to ON, then replace the System Check tach.

If the needle does go to zero, then you have to troubleshoot the tach and chargine circuits and the LOW OIL float inside the tank and the wiring.

The electronics inside the tach operate the alarm horn and the lights, as well as the rpm indication. You may have a faulty tach and the quickest check is substitution.

OCMDJack posted 08-16-2009 06:13 PM ET (US)     Profile for OCMDJack  Send Email to OCMDJack     
Seahorse, thank you. Needle does not move at any time. I'm not up on System Check.
jimh posted 08-17-2009 08:27 AM ET (US)     Profile for jimh  Send Email to jimh     
Were there any electrical abnormalities that occurred around this same time?
OCMDJack posted 08-17-2009 09:01 AM ET (US)     Profile for OCMDJack  Send Email to OCMDJack     
Jimh--No abnormalities. Motor had been running well,used it off and on for about an hour. Started up to head home and lost power. At first I thought it was just a fuel problem and barely made it to dock, later discovered that Tach was not working.
Tach remains in "frozen" position

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