Help wiring up horns

[Leeholty]

Ive recentley purchased a set of stebal air horns for my defender and was wanting help to wire them up through a seperate switch and relay to the standard horns so i dont have have to swap them over for mot and still have standard horns.

Ive got a momentary switch and relay plus a inline fuse with 30amp fuse. Any help would be greatly appreciated thanks.

[busta]

Loads of info/wiring diagrams on the net. It's hard to explain a wiring diagram in words but you basically need to get a + wire to your switch, then from there to the relay spade 86. Then run a fused 12v wire to the relay straight from the battery to spade 30. Run an earth wire from spade 85 to an existing earth, battery negative or just anywhere on the chassis. Connect the red wire on the compressor to spade 87 and the black compressor wire to an earth.

Plug your air hose into the compressor, nail the horns on the roof and go get horny!

[Petemate]

Find the feed for the horn(s). Need to find the common wire before it splits up if there are two horns. Interrupt this. Obtain a switching relay, which has terminals 85, 86, 30, 87 and 87A. Feed from the car (now interrupted) goes to 30. From 87 back to the horns. Now get a single on-off switch, hide it, take a feed (3amp enough as relays take hardly any current in the switching circuit) to 85, 86 goes to earth. 87A goes to the air horn compressor, Positive, negative to earth - bingo. MOT time, operate the switch for the switching relay to restore operation of the 'normal' horn(s).
HTH
Pete

Edited by Petemate on Sunday 17th October 23:01

[Leeholty]

cheers for the help chaps cant wait to get them wired up.

[Petemate]

busta said:

Loads of info/wiring diagrams on the net. It's hard to explain a wiring diagram in words but you basically need to get a + wire to your switch, then from there to the relay spade 86. Then run a fused 12v wire to the relay straight from the battery to spade 30. Run an earth wire from spade 85 to an existing earth, battery negative or just anywhere on the chassis. Connect the red wire on the compressor to spade 87 and the black compressor wire to an earth.

Plug your air hose into the compressor, nail the horns on the roof and go get horny!

Nice one Busta - you beat me to it while I was busy scribbling. My method will enable the main horn push to be used with either horns but we were thinking along the same lines!!

[TheLurker]

busta said:

nail the horns on the roof and go get horny!

[busta]

Petemate said:

busta said:

Loads of info/wiring diagrams on the net. It's hard to explain a wiring diagram in words but you basically need to get a + wire to your switch, then from there to the relay spade 86. Then run a fused 12v wire to the relay straight from the battery to spade 30. Run an earth wire from spade 85 to an existing earth, battery negative or just anywhere on the chassis. Connect the red wire on the compressor to spade 87 and the black compressor wire to an earth.

Plug your air hose into the compressor, nail the horns on the roof and go get horny!

Nice one Busta - you beat me to it while I was busy scribbling. My method will enable the main horn push to be used with either horns but we were thinking along the same lines!!

Yeah that's how I'd do it but LeeHolty said he has another switch he wants to use. This thread has got me looking at awooga horns and train horns now. I have 2 spare buttons on my steering wheel that need jobs to do...

[Leeholty]

i would love a set of train horns but i dont want to spend that much although maybe i should.
http://www.youtube.com/watch?v=icnRMW6P9nc

[Petrolhead_Rich]

Leeholty said:

Ive recentley purchased a set of stebal air horns for my defender and was wanting help to wire them up through a seperate switch and relay to the standard horns so i dont have have to swap them over for mot and still have standard horns.

Ive got a momentary switch and relay plus a inline fuse with 30amp fuse. Any help would be greatly appreciated thanks.

As long as they go on with the standard horns they will pass the MOT, just wire the relay into the plug on the existing horns... but leave the existing horn connected...