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Author Topic:   OMC warning horn sounds continuously.

pglein posted 05-09-2009 06:30 PM ET (US)
'85 Johnson 150: the warning horn sounds continuously, as soon as you turn on the key, and does not stop. I did not see this condition mentioned in the reference article. Any ideas?
pglein posted 05-09-2009 06:44 PM ET (US)
Looks like it was a false alarm. It went off as soon as I started the engine.
seahorse posted 05-09-2009 11:23 PM ET (US)
On your motor, either a sensor is faulty, there is a short in the tan wire circuit, or the horn is faulty (only if you have the later model self-test horn).
The first thing to try is to disconnect the oil tank low-level wires at the engine. It is very common for the electronics in the oil pickup assembly to go belly-up and give off erroneous signals.
If you had a severe overheat condition recently, sometimes a temp sensor shorts internally, giving you the solid horn alarm all the time.
Let us know what you find out.
pglein posted 05-10-2009 10:56 AM ET (US)
Any of those sound like very likely posibilities. The engine is 24 years old, and I rebuilt it lasy year. It's entirely possible that I may hav e messed something up while rebuilding.
However, I'm not sure how I would diagnose it, as it is no longer giving the buzzer at all.

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Author	Topic: OMC warning horn sounds continuously.
pglein	posted 05-09-2009 06:30 PM ET (US) '85 Johnson 150: the warning horn sounds continuously, as soon as you turn on the key, and does not stop. I did not see this condition mentioned in the reference article. Any ideas?
pglein	posted 05-09-2009 06:44 PM ET (US) Looks like it was a false alarm. It went off as soon as I started the engine.
seahorse	posted 05-09-2009 11:23 PM ET (US) On your motor, either a sensor is faulty, there is a short in the tan wire circuit, or the horn is faulty (only if you have the later model self-test horn). The first thing to try is to disconnect the oil tank low-level wires at the engine. It is very common for the electronics in the oil pickup assembly to go belly-up and give off erroneous signals. If you had a severe overheat condition recently, sometimes a temp sensor shorts internally, giving you the solid horn alarm all the time. Let us know what you find out.
pglein	posted 05-10-2009 10:56 AM ET (US) Any of those sound like very likely posibilities. The engine is 24 years old, and I rebuilt it lasy year. It's entirely possible that I may hav e messed something up while rebuilding. However, I'm not sure how I would diagnose it, as it is no longer giving the buzzer at all.