6 replies to this topic

[balloonatic97]

I've wired up my new air horns, but it just doesn't want to work.
There's power running through terminal 30 on the relay (from the live power feed), and terminals 85 and 86 (which connects to the horn switch and the earth wire) when I press the horn switch, but none running through terminal 87, which connects to the air compressor. But it doesn't even work when i connect the power straight from the battery to the air compressor....
Do I need a new relay switch? Do I need a new compressor? I'm confused! (Again!)
What have I done wrong??

[lrostoke]

Sounds like you have two issues.

The relay appears to be wired right. Is 85 or 86 getting a live feed when you press the horn (which ever is the live)

are the earth connections good, if yes to both then like you say 87 should go live when the horn is pressed. If it doesn't then faulty relay


But connecting the compressor direct to the battery should make the compressor work, is the compressor getting a good earth ??

[L400RAS]

Can you hear the relay clicking when activated?

[mini_adam]

have u gone to a seprate switch ?? because i made a mistake and didnt realies the instructions are wrong :S
mine is linked to main horn and to a switch

[balloonatic97]

The relay does click when i touch a certain terminal with the lighty up pen thing. I think its when i touch the terminal that links to the horn push.
I did originally wire it to an on/off/on switch but have since abandoned that. It is now wired straight to the horn push using the wires from the old horn.
Both 85 and 86 get a live feed when i push the horn, just not 87 (which connects to the air compressor). As you said i shall check the earths to both the compressor and the relay, if it still fails then i shall try a new relay and let you know how i got on.

Thanks guys =)

[lrostoke]

see if this helps

This guide will work for both twin tone air horns and musical, main difference you will need to find room for all the horns on a musical set..

1st find a good place to mount the horns. I chose under the n/s wheel arch because the slats in the inner wing made an ideal place to clamp the horns to...I made a bracket to mount the horns to first, then clamped that bracket to the slats. Make sure if you mount them here they do not foul on the wheel, check wheels at full lock both ways



Next the compressor unit, if you use the tubing that comes with the kit you will have a limit how far from the horns you can mount the compressor. I was lucky there was already a hole in my bulkhead sealed with a gromet that I was able to utilise for the mounting of the compressor



Next wiring find a suitable place for the relay, again no servo on my mini so I have a nice open space to mount it



On the compressor you will find two terminals postive and negative, the positive you run a cable from that to a terminal marked 87 on the relay.
The negative I connected to the same bolt that mounts the compressor to the bulkhead.

Next on the relay terminal 30 you connect to a permant live feed, the live side of the starter solenoid is a good source for this, I've been a bit rough here in that I ran out of ring connectors so the cable is clamped by the two ring terminals already on the solenoid, I will replace this once I buy some ring connectors. You will need to fit a 30 amp inline fuse on this cable.



Terminal 86 on the relay goes to earth, again Ive used the car body, the black wire attached to the mounting screw of the relay



Finally Terminal 85 goes to the horn switch, easiest way of doing this is to unplug the spade connector that plugs into the existing horn and plug your cable you have attached to terminal 85 into the wire that went to the horn.

[balloonatic97]

Lol I've already read this from other posts, it has been my bible, which is why i'm so frustrated this still isn't working. Havn't got round to doing what I said yet but have plenty of time today, so i'll let you know