Horn wiring

[EdMorris]

I found some old air horns that I used to have on my mini years ago, to scare old ladies. I want to fit them to my supe, but its not quite as easy as a mini fuse box (at least not for me), so I was wondering if anyone can help.

 

I've tested the compressor and all is fine, the horns sound. I just need to work out the wiring. Its all a bit confusing to me even though I think I'm making it more difficult than it needs to be. I've attached a pic of the relay box connections (bit poor quality though), to aid explanation.

 

Basically, I need to know where the one wire from the original horn goes. I think it must carry power (which eventually connects to the horn push), and the horn itself is the earth. If this is the case, presumably all I need to do is connect the wire I labelled 'fuse box' to this original wire in the car, earth the relay and compressor, and bobs ya uncle. Is that right?

 

Cheers for any help.

[absz]

why don't you use the earth wire which is connected to the orignal horn itself.as the switch wire on pin 86. use pin 85 as a ignition postive. connect pin 30(fusebox)onto battery positive. then use pin 87 as the positive feed to the horn. ignore pin 87A.

hope that makes sense:innocent:

[EdMorris]

Yeah it does, kinda. Just need to locate the original power wire for the horn. Thats the problem I have - where does the power come from? I could only find one wire that attaches to the horn so I presumed that was the power and the metal horn body itself was the earth. I'll have a closer look. Thanks.

[imi]

The single connection from the stock horn, is that the Ground or is that HOT?