Horn not working

[james12345]

Okay, so the Chim failed the MOT on the horn not working, and I've been tearing my hair out ever since as to why.

Fuse known to be good - swapped with others, other circuits still working - horn not.
Relay known to be good - swapped with others, other circuits still working - horn not. No clicking at relay when horn button pressed.
Not getting 12v at horn terminals.
I'm not getting 12v at the horn switch either (either within the button or the purple / black with within the cowling). Not surprising if I'm not getting 12v at the horn itself though.

Here's the clincher - it's just back from having new outriggers. Could there be something there that's been disconnected / changed / missed that may be stopping the horn from working?

I'm now beyond stumped!!!

[james12345]

Tried earthing the purple/black behind the cowl - still no horn. Any idea where the connector is in this wire? Might be the next best place to check...

[james12345]

Well the dash is half off anyway, so can easily check under there! Just replaced the alarm as the old one was faulty - perhaps I could have dislodged something?

If I were to steal a live from somewhere, what would be the best place to connect it to? All the way to the horns themselves, or something around the fuse box to have the relay involved?

[james12345]

So no luck -the live by the rad is only going to be live when the fans kick in, there's no permanent love there to test from.

Reading back through your earlier post, you say the only other thing in that spur is the heater - do you mean the heater fan, as that isn't working either at the moment. I put it down to a bad heater control box, but having got that it, there's no burnt connectors on it.

Could well all be linked -with the dash to off there nothing that's obviously this connector though!

[james12345]

Yep, block K appears to be where it's all at -and in keeping, this also has a connector to the heater on it from what I can see... Buggered if i can find it though!

[james12345]

Also, I'm still holding out hope that someone who's had their outriggers done will pop along and say "Don't forget to reconnect the plug that's in position xx, or your horn won't work! "

[james12345]

Right - fixed it!

I'd previously swapped the relay with the one at position 1, both marked as MO404. Decided to try to swap with another - also marked as MO404, the handbook shows it as man beam - but this one was brown rather than yellow.

Pressed the horn, and it only bloody worked!