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Old 05-24-2020, 07:50 PM
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Heybuck Heybuck is offline
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Join Date: Sep 2000
Location: Melbourne - Australia.
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Correct me if I'm wrong (it's a long time since I looked at this area), but my understanding is the horns have constant power to them and the circuit is made by when pressing the horn bar, you create the ground.

In exactly the same way the wipers work and the interior light works. You create the circuit by grounding the item.

In the case of the horn relay, it is connected directly to the battery and the wire from the horn bar trips the relay creating the noise. So if you simply pull off the ground wire from the relay, use a loose piece of wire and touch it between the relay ground and the ground side of the battery, if you get noise, the relay is working and you then need to trace back to the horn bar to establish the fault.

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