Re: horn troubleshooting

Posted by BigKev On 2015/2/16 14:27:55

The horn wire grounds the relay to trigger it, which then supplies power to the horn. The horn is grounded via where it is attached to the car.

So, a quick test would be to run a jumper from the battery to the wire terminal on the horn and see if it works. This bypasses the relay. If it works, then the relay or wiring with the relay is the culprit. If not, then verify the horn has a good path to ground and paint is not preventing that.

If the ground is good, then the horn has a problem internally.

The horns pull a lot of juice, so you need a battery to test with, not a low amp battery charger. I use a bump switch to test stuff like that, then I don't have to work about any arcing/sparks.