MGB discussion board for Roadster and GT classic car models.
- Posts: 1
- Joined: Fri Sep 13, 2019 8:23 pm
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
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
- Posts: 59
- Joined: Wed Jul 05, 2017 11:41 am
Also check you are getting a good earth
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