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Author Topic:   Mercury Warning Horn
cubanwhaler posted 02-27-2008 07:18 PM ET (US)   Profile for cubanwhaler   Send Email to cubanwhaler  
I have a short somewhere OR the horn is shot. The oil and overheat sensors are OK according to the manual's troubleshooting procedures. I spoke with a marin mechanic today and he was telling me how to check the horn running a hot lead to one of the wires and doing something else with the other wire. (its a 2 wire horn. One purple the other tan/blue) I was at work and coudn't write down all of the stuff he was saying in time. Anyone know what he may have said? It was a way to check the horn by running a hot lead and using a electrical tester with the bulb. Thanks.
jimh posted 02-27-2008 08:57 PM ET (US)     Profile for jimh  Send Email to jimh     
Check the color coding at

It appears that you connect the +12-volt DC from the battery positive to the VIOLET lead and then connect the battery negative to the TAN/BLUE STRIPE lead. This should make the warning buzzer emit an aural alert.

cubanwhaler posted 03-01-2008 02:49 PM ET (US)     Profile for cubanwhaler  Send Email to cubanwhaler     
I prepped the boat for the new season today and planned on getting the horn issue under resolve. I connected battery and gas (electronics were disconnected) started her up and viola! no more horn. So, the question now is were was the short being created in my not so fancy wiring of electronics!!
David1877 posted 03-04-2008 01:08 AM ET (US)     Profile for David1877  Send Email to David1877     
I have a Mercury Optimax. The first season, I made a few trips to the dealer with warnign horns. I dont recall amything being wrong with the motor. Now it works ok.

I think I saw a few similar posts last year. Is your engine new?

cubanwhaler posted 03-05-2008 04:29 PM ET (US)     Profile for cubanwhaler  Send Email to cubanwhaler     
No its an 2001, but everything is running fine. My bad ad hoc wiring of the navigation lamps were the issue.

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