Horn not working

[donald]

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?
Donald

[Dave.S]

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

Dave