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Author Topic:   OMC SLOW startup alarm when running
Eric posted 09-16-2002 12:25 AM ET (US)   Profile for Eric   Send Email to Eric  
1999 Johnson 90. My horn blows for 1 second and the lights in the tach count down while running the boat. This is just like when the ignition is first switched on, and is how the system shows that it is working.

It reminds me of the time I had a battery cable chafe through on a new truck. The momentary electrical short was just long enough to cut out the cruise control. I was lucky not to have a fire, since it was rubbing on a tranny cooler line, and burned a hole in the line (while towing a trailer with 7 racehorses!).

I was worried that I might have a problem with the VRO, but that checked out fine with the dealer when in for the 100 hour service.
It is obviously an electrical problem, likely a short somewhere, and doesn't seem related to the performance of the engine (doesn't miss or cut out when this happens). I had it suggested that I change out the system check tach, but I don't know if the horn would blow if just the tach was going bad. Does anyone know if the horn is wired through the tach?
Any other suggestions?
I'll check the connections on the tach and elswhere on the wiring harness tomorrow.

tocobill posted 09-17-2002 01:36 PM ET (US)     Profile for tocobill  Send Email to tocobill     
99% of the time this is caused by a loose battery cable, pos or neg. Any interuption in the 12V feed to the motor will cause what you see happening. If the cables are tight and clean, next check the ignition switch. Good Luck, Just my .02
tocobill posted 09-17-2002 01:41 PM ET (US)     Profile for tocobill  Send Email to tocobill     
About the tach, not likely as the following conditions only will cause the horn to sound when operating properly.
1- initial power on, the horn sounds to tell you it is working.
2- overheat
3- fuel restriction (check eng light)
4- low oil
5- no oil
Eric posted 09-19-2002 09:57 PM ET (US)     Profile for Eric  Send Email to Eric     
Tocobill, that's a good suggestion, and fits with my experience with the truck. I haven't had time to check the connections, but I think that it happened on both battery 2 and battery 1. However, the short could still be at the battery switch.

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