Re: 1990 50 force
If the engine was not running as you say, I would look at the temp. sensor that is located below the bottom spark plug. When the temp. of the engine gets to the sensor setpoint, the sensor goes to ground and completes the circuit to the alarm horn and it sounds. The only other way for the alarm to sound is if that sensor wire is touching a ground somewhere in its run from the engine block to the horn.<br />A quick way to check out the sensor would be to disconnect the wire lead from it and then use an ohm meter or continuity checker. Place one lead of the meter on the stem where the wire was removed and the other lead on some good engine ground, the wrench flats of an installed spark plug will work fine. If the engine is cool and the sensor is ok, you will read a high ohms (no continuity) resistance. If your ohms are low (continuity) then the sensor is bad.<br />Now if the sensor is ok, you must check along the length of its wire to find where it's touching ground. When you find it, wrap a few turns of electrical tape around it and that will do until you want to replace the bad wire section.
