Horn not working

MGB discussion board for Roadster and GT classic car models.
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Joined: Fri Sep 13, 2019 8:23 pm

Horn not working

Post by donald » Sat Sep 14, 2019 10:15 am

When connected to an external battery the horn works. When I connect the pos and neg wires to a test lamp it lights. When I replace the test lamp with the horn it only clicks or makes a feeble noise. What is wrong?

Posts: 4
Joined: Thu Sep 05, 2019 12:22 am

Re: Horn not working

Post by Dave.S » Tue Sep 17, 2019 3:16 pm

Sounds like you have a high resistance somewhere and not delivering the correct current (amps) to the horn.

You need a multi meter to check voltage and current to the horn.

Simple test is to use a headlamp or spotlight bulb as the test lamp as they require more current to light up than a simple test lamp.

Might be worth cleaning the fuses and holder as well as that might be the problem area, similarly clean and make sure you have a good contact on the horn button on the steering wheel.

Hope it helps


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Joined: Wed Jul 05, 2017 11:41 am

Re: Horn not working

Post by Not_Anumber » Mon Oct 21, 2019 3:17 pm

Also check you are getting a good earth

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