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Merc 502 Alarm

Old 05-17-2018, 01:02 AM
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It would be wise to scan the engine to look for faults and out of spec parameters.

Possible general warning 1 - oil pressure switch. I would look there if no scan is done. A scan can pin point the fault if one is present.

Mefi 3 does not have an EXHAUST temp fault / or warning for stock OEM apps.
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Old 05-17-2018, 10:48 AM
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Hey BUP. On a side note, off subject for a sec. Did you ever get the Lavey done?
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Old 05-17-2018, 11:05 PM
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The high water temp alarm doesn't go off until about 195*.and the sensor is in the intake manifold.

You could just have an alarm wire that has rubbed through and is grounding itself.
A ground completes the circuit and sets off the alarm. I had it happen several years ago.
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