Over temp alarm

[bamajpippin]

I have a 1989 Evinrude 60 hp outboard. I was on the lake the other day when the over temp alarm came on and stayed on not intermittent. The motor continued to work as nothing was wrong. Tale tale was strong and I could touch any part of the motor and it was nowhere near hot enough to burn me. I took it home and the next morning I turned the ignition on and it was still giving an alarm. It's a constant alarm and it hasn't stopped since it started. I replaced the over temp sensor but that did not fix it. Looking for some help.

 

[w2much]

A pain in the neck to fix sometimes. I am working on a similar alarm issue. You need to run diagnostic test as outlined in the shop manual. First thing to try is to disconnect the wire which goes to it from the harness. Could be a bad temperature sensor. Also check your wires and harness for abrasions, insulation, corroson, ect You may unplug the main plug on the harness to are least isolate the issue from the engine itself or the boat harness.

 

[racerone]

Maybe a defective horn.

 

[Joe Reeves]

Your problem... to test.... Simply have the key in the ON position, then remove the TAN wire from the warning horn. If the horn continues to beep with that TAN wire removed, the horn is faulty.

If the horn stops beeping the instant you remove that TAN wire, a sensor is shorted out at the engine... OR... that TAN wire is grounded somewhere between the horn and the sensor(s).

 

[bamajpippin]

Thanks for the responses. I will try what you guys recommended and will update when I'm done. I know it's not the sensor itself because I just replaced it. I was thinking that there could be a short somewhere but did not consider it could be the horn itself.