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The horn has stopped working on the Mrs E36. I checked the relay and fuse, all ok. The local garage had a quick look one day and said there was no power coming into the relay.
Can I run a wire from the horn with a switch ? Is the relay actually needed? I just need a quick solution to get the horn working for it mot next week.
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Ryannn
Posted a lot
Posts: 2,421
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The relay is to reduce load on the switch, it’s far more common with steering wheel mounted ones.
You could wire a horn up to a new switch, or get a new power source to the relay, unless it’s not the constant that’s missing?
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I ended up trying to check all the wiring, but I have limited knowledge with this. I found 2 sides of the relay connection to be live with 12v. I thought possibly the Earth was at fault so I ran a wire from what I I thought was the Earth on the relay to the Earth on the battery, when I did this the horn sounded. So for now I have ran a wire from 85 on the relay to the Earth on the battery. With this wire split and joined with a switch I can now turn the horn on and off. Not ideal at all but at least I can sound the horn from inside the car and it’s enough to pass the mot.
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