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Old 03-09-2018, 08:18 AM   #1
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Horn Broken

I have a 2005 Mainship 400 and both upper and lower horn switches are not operating the horn. I suspect a blown fuse/circuit breaker.

Does anyone know where the fuse/circuit breaker is for the horn on a MS 400?

Jeffrey Guttenberger
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Old 03-09-2018, 10:10 AM   #2
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Stupid question, but worth asking. The switch at the panel needs to be on for the helm. At the helm, there is a switch for the horn. Both need to be on before the horn at that station will work. Both the power to the helm station and the horn switch at the helm are on before you hit the horn, correct?
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Old 03-09-2018, 10:55 AM   #3
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I don't think it's a stupid question. Thanks for the response.
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Old 03-09-2018, 11:57 AM   #4
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Check power to horn when pushing switch prior to checking for fuses or if there's a main switch in breaker or as previously said any switches at either helm.
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Old 03-09-2018, 03:34 PM   #5
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Both switches are on.....just wondering where the circuit breaker would be located.

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Old 03-09-2018, 04:26 PM   #6
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It is highly unlikely both switches or horn buttons are faulty so yes you have to ensure you have power but also they rely on a good ground to complete the circuit and sound. Check your ground wire or jump to ground temporarily to check. Good luck!
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Old 03-09-2018, 07:42 PM   #7
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This is a prime reason/example for not having hidden inline fuses and breakers.
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Old 03-10-2018, 05:18 AM   #8
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One thing I've noticed on this site. Most of you have pictures of your boat as your avatar. I have a picture of my wife. What am I doing wrong?

lol

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Old 03-10-2018, 08:58 AM   #9
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One thing I've noticed on this site. Most of you have pictures of your boat as your avatar. I have a picture of my wife. What am I doing wrong?

lol

Jeffrey Guttenberger
Jeff, looking at the picture of your beautiful wife, I want to know what I am doing wrong.
Must have something to do with my sterling personality?
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Old 03-10-2018, 10:47 AM   #10
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Jeff, looking at the picture of your beautiful wife, I want to know what I am doing wrong.
Must have something to do with my sterling personality?
Yeah, what he said!!!
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Old 03-10-2018, 10:49 AM   #11
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Now back to the horns, not the horny old guys.

One side of the switch is 12Vdc. Check with a VOM.
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Old 03-10-2018, 10:54 AM   #12
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Now back to the horns, not the horny old guys.

One side of the switch is 12Vdc. Check with a VOM.
Yes to the first sentence.
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Old 03-10-2018, 11:02 AM   #13
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Your Avatar's great and we all give you a thumbs up.


Sign on the back of a car in Ireland.
Horn broken, watch for finger !
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Old 03-10-2018, 11:04 AM   #14
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Your Avatar's great and we all give you a thumbs up.


Sign on the back of a car in Ireland.
Horn broken, watch for finger !
Deaf person onboard, hope you can read sign language.
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Old 03-10-2018, 11:36 AM   #15
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That's a cracker Dan, I'll remember that for future reference.
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Old 03-10-2018, 08:30 PM   #16
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On my MS 2005 430 aft cabin, I believe you have to have the lower helm horn switch in the on position which will allow you to use the fly bridge horn switch.

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Old 03-13-2018, 11:02 AM   #17
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The breakers are mostly either in the main panel next to the galley, or in the panel in the engine room on the aft bulkhead.

Turn on the switch on the main panel labeled "bridge main." I'm not sure that it is what it is (you said neither the lower helm nor the upper works, correct?) but it is worth a try.

Activate the switch at the lower helm that say "horn."

If that doesn't work then look closely at the breakers in the ER.

If none of those things help it's time to get out the voltmeter.

Some of the wiring on my 400 is "creatively" done. A lot of the switches on my FB helm don't do anything at all. My Auto Pilot and DSM stayed on 24/7 when I bought the boat, I wired a switch into them.

I think the biggest weakness of my boat QC wise, is how they rigged the wiring. I try to fix things as I go along, but there are a lot of things they could have done better.

One thing I did that has really helped is to run the third leg of my charger to the genset start battery. I was always fighting a dead battery on the generator before that. I also reconfigured the battery set up with a dedicated start bank and house bank. Much better.
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Old 03-13-2018, 11:22 AM   #18
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Old joke, why does a cow wear a bell? Because it horns dont work.

So until you figure out where the problem is with the horns...... get a really big bell?
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Old 03-13-2018, 01:30 PM   #19
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Maybe it's the horn itself. Very common failure. Time to get out the 12v test light or DVM.
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Old 03-13-2018, 02:01 PM   #20
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I am going to assume you shorted out the horn buttons.
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