Author Topic: Horn repair.  (Read 433 times)

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Offline Potsy636

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Horn repair.
« on: February 26, 2016, 07:42:57 PM »
So I am getting to the final parts of my c10l before I put it through its road test, it has an original horn that doesn't worn, I have taken it off the bike and connected it to a battery but it's silent. Now are they easy to repair or is it a job for a man that can.

Cheers Kelvin.
Kelvin
Isle Of Man

Offline Ginge

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Re: Horn repair.
« Reply #1 on: February 26, 2016, 08:59:28 PM »
On my C10L The horn barely worked. The gibbons were too far gone to ressurect without spending stupid money.  I replaced the innards with a horn off a Yamaha from the wreckers.  I think it is 12 Volt but it passes muster.

You could mount it as per original, but wire another horn in elsewhere if you didn't want to gut it.

Ginge
Ginge.

Online Owen

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Re: Horn repair.
« Reply #2 on: February 27, 2016, 08:13:16 AM »
Have a look at the service info.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online MilitaryRon

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Re: Horn repair.
« Reply #3 on: February 27, 2016, 08:50:36 AM »
Yes but isn't the horn shown by Kelvin a 'Clearhooters' HF 150 or am I mistaken? Same horn as fitted to LE Velo's. They are probably the cheapest and easiest to find at jumbles/ebay.  Ron

Offline Potsy636

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Re: Horn repair.
« Reply #4 on: February 27, 2016, 07:15:12 PM »
Okay best look for another horn, I don't fancy pulling it apart, the modern horn hidden under the fuel tank might be the best option.
Kelvin
Isle Of Man

Online Owen

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Re: Horn repair.
« Reply #5 on: February 28, 2016, 05:09:49 PM »
Unfortunately I don't have any HF150 service info.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline Aquarius

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Online Brillandy

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Re: Horn repair.
« Reply #7 on: March 01, 2016, 02:34:20 PM »
I've just repaired my C10L horn, which looks to be the same model shown, and with the same symptom - i.e. dead.  Not too difficult.  The problem was the make & break contacts were dirty/pitted and just needed cleaning with a small jewellers type file.  There was quite a bit of surface rust on the inside of the covers, so I used a small amount of sanitary silicone sealant around the various joints when reassembling in an attempt at keeping the moisture out.
Hope this helps
Andy
56 C10L
60 Nuffield DM4

Offline Potsy636

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Re: Horn repair.
« Reply #8 on: March 01, 2016, 08:23:14 PM »
Hello I thought I would strip my horn tonight but before I connected it up one last time to a battery, I had a very faint noise, but not a horn noise, I screwed out the big screw on the back of the horn half a turn and I now have a screaming chicken type noise, I am tempted to leave it connected to a battery for a bit of a work out.
Kelvin
Isle Of Man

Online Owen

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Re: Horn repair.
« Reply #9 on: March 01, 2016, 09:05:47 PM »
You normally set them to the best noise at less than 4A current.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline Potsy636

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Re: Horn repair.
« Reply #10 on: March 01, 2016, 09:13:34 PM »
Okay cheers Owen, should I adjust this screw with my multimeter connected between the battery and horn and see if I can get a horn type noise.
Kelvin
Isle Of Man

Offline Potsy636

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Re: Horn repair.
« Reply #11 on: March 01, 2016, 09:17:36 PM »
Hi also forgot to ask, with the amount of rust on the rear of the horn there is no marking for the plus or minus wires on the rear connections, will this matter.
Kelvin
Isle Of Man

Online camman3

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Re: Horn repair.
« Reply #12 on: March 01, 2016, 09:46:43 PM »
You need to set meter to 20 amp current measurement range, make sure meter leads are in appropriate sockets, and connect in series to the positive feed to horn.
The horn will operate while you adjust it and measure current at same time.
Doesn't matter which way round you connect horn terminals.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline Potsy636

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Re: Horn repair.
« Reply #13 on: March 01, 2016, 09:49:54 PM »
Cheers Graham, could be a job for tommorow, let's hope my neighbors are out.
Kelvin
Isle Of Man

Offline Potsy636

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Re: Horn repair.
« Reply #14 on: March 04, 2016, 08:20:07 PM »
Job done, a great sounding squeal at under 3 amps. 😀

Thank you.
Kelvin
Isle Of Man