Overheat alarm on Evinrude
 

Maybe one of you fellas can point me in the right direction before I spend any money or make something worse. I'm getting an overheat alarm immeadiately upon start up with a cold engine. The engine ran great last time a used her, about 1 1/2 months ago. Went to crank her up in the driveway and am getting the alarm. I'm getting plenty of psi on the gauge and a solid piss stream out the back. I'm thinking maybe a bad connection or ground maybe? The engine is a 1990 Evinrude 225 looper. Any advice is much appreciated.

There are two of these, on the rear right and left of the motor.
http://i175.photobucket.com/albums/w...Picture205.jpg
The picture is of one that has been spliced. The actual connection folds apart. Find each one of these, disconnect them and crank the motor. While running reconnect till the horn comes on, that will be the bad sensor.
http://www.wellcraftv20.com/communit...ing+to+repairs

If I'm not mistaken, it will start the horn without the engine on, just the key switch turned on.

I'll go try it now Thanks bro!

Well tsubaki I disconnected both of them and got the alarm still!

She sounded a little rough so I shut her off. I hope it's nothing serious.

Now, if you do happen to find it to be one of the sensors, be sure and determine if it is acting up when cold or if it is after the engine has ran a while.
If when cold, probably the sensor is bad.
If after running a while, could be a stuck thermostat or blockage somewhere.
If you have to change the sensor, do both of them and the thermostats also.

Is the oil injection gone completely? Try unhooking the fuel restriction sensor by the fuel pump, that can also trip the buzzer.

Do you still have the oil injection system connected?

Does it matter that my tach is presently disconnected?

VRO disconnected, all premix

FERM's right. All the horn, oil and sensor stuff is connected together and tripped by the ground. Any of these can be the culprit.