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Is the alarm a constant tone or a series of beeps?
Can I get the engine serial number please.
Did you take the engine cover off and touch the top of the cylinder to see if it was running hot?
Got the serial number
When was the last time the cooling system was serviced with a new impeller and thermostat?
The alarm will self clear once the problem stops.
Lets do this. On the front of the engine near the spark plugs is the temp sensor, it is a single tan wire. Disconnect it and see if the alarm stops.
If it does not stop, go over to the oil tank. On top of the oil tank you will see 2 wires for a sensor. Disocnnect those, and then take the 2 wires that go to the oil sensor and jump them together with paper clip. Let me know if the alarm stops then.
WHat gray wire did you disconnect, it should be tan. Do you see a tan colored wire near the spark plugs?