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Old 07-15-2014, 11:57 PM   #1
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Default Horn not working on 2001 Maxum 2300sc

Here's a puzzle for you all... my horn on my Maxum 2300sc has stopped working... I removed the horn from the bow and tested it across the 12v battery and it sounds just fine... I then put my multi-meter across the yellow and brown/green wires feeding the horn and they send 12v when the horn button is depressed at the helm... so, there is nothing wrong with the horn itself and the wires deliver 12v when the button is pressed, but when it's all connected together, the horn does not sound when the button is depressed...

Any ideas?
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Old 07-16-2014, 01:30 AM   #2
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Well if 12 V is present on the wires at the horn and the horn works if you directly apply power I can only assume the contacts need to be cleaned on the horn and wires.

You are measuring power on the wires directly where they connect to the horn, correct? There is a relay between the button and horn.
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Old 07-16-2014, 01:47 AM   #3
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Turn on your docking lights
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Old 07-16-2014, 11:25 AM   #4
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One more test. Try measuring for 12 V with the horn connected. If the horn relay has pitted contacts it could cause a voltage drop that is not present in the open circuit test you did.
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Old 07-16-2014, 01:40 PM   #5
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Are you getting 12v on the wires, or 12v-ish? The electric horns are cranky about low voltage.
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Old 07-16-2014, 02:41 PM   #6
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Thanks for all the replies...
- I am getting 12+V at the wires
- I have cleaned the terminals to within an inch of their lives
- when (if) it stops raining, I'll try testing with the horn connected

Very frustrating, as you can imagine... I'll keep you updated...
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Old 07-16-2014, 09:32 PM   #7
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OK... it stopped raining, so here's what I did (it's STILL not working, btw):
- I removed the horn completely and sanded the terminals to within an inch of their lives... shiny shiny copper now
- I tested the horn on my car battery and it woke Australia, so no problem there
- I cut off the female spade connectors and replaced with new, so the connections at the business end of the horn should be fine now
- I removed the push switch and emery papered the terminals there, too... and squirted a liberal amount of WD40 everywhere just for good measure
- I tested the push-button switch with the continuity setting on my multi-meter and that works fine

Unless I'm missing something, perhaps Shrew is right and I'm only getting 11.5V (or less?) at the terminals (enough to move the needle on my multi-meter, but not enough to sound the horn)... so, I've put battery 1 on charge overnight and will try in the morning...

Unless anyone else has any better ideas, I'll let you know what happens in the morning... I'm still open to suggestions...

Cheers,
Simon
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Old 07-17-2014, 12:52 AM   #8
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As I said if the relay has pitted contacts a voltage drop will occur 11.5v or less is the result. Get a digital meter and get more accurate readings.
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Old 07-17-2014, 02:00 PM   #9
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Thanks Mike... it MUST be that, as I have had the battery on charge all night and no joy this morning

Do you know where I shoudl start hunting for said relay?... behind the dash, or somewhere else?

Thanks,
Simon
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Old 07-17-2014, 02:50 PM   #10
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Ground.... Ground.... Ground.... boats are wood and fiber glass.... You have 12V and you apparently have a "negative source" somewhere because it sounds as if you are testing the circuit. Run a jumper wire from the (-) on the horn to your negative test light source or a (-) on the battery and see what happens
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