hagar24

Hi all
i am new here and I own a 87 XR4Ti and I am changing the horn from the steering wheel to the euro style in the indicator switch button but not sure how to wire to horn, is there a diagram that shows how it's wired on the euro cars???

Iain Mac

The horn on UK & european XR4is is in the steering wheel - early cars had a button in each of the two spokes. Later cars had a large horn button in the centre of the wheel.

DazC

iTrader: (1)

did the early mark 1 sierra's not have the horn button on the indicator stalk like the mark 3 escorts? I thought they did.

DazC

iTrader: (1)

can't you buzz the contacts out for the switch and just connect the 2 wires that went to the slip rings onto those terminals.

Iain Mac

Don't know about low-spec cars, but the XR4i only ever had it on the steering wheel.

silver

Early low spec cars did, quite rare now though.

hagar24

There is a wire in the connector for the horn button on the XR that fits the horn button in the stalk but the problem is I don't know where it goes or if it changes colour in the engine bay so thats why i would like to see wiring diagram and the button sends power when you push on it, so since I already have power to the horn from the original wires, how do I connect the stalk to make the horn work from there???
Thats my problem, the switch is from a MK3 escort I think

tabetha

If I remember right the horn stalk one is on the left, so put ignition on, and probe the connector on the stalk for a switching feed when the horn button is pressed, it most likely uses the same supply that the light flash uses.
tabetha

hagar24

I did find the connection already at the switch but the problem is how I do connect to the horn from there ??

jon@work

iTrader: (5)

I've done this, and a mk3 escort stalk works fine on sierras with a little re-wiring.

The standard sierra horn push switches the earth side of the horn relay (ie the relay has a permanent 12V to the coil). If you cut off the connector that goes onto the slip ring, you'll find that one wire has got permanent 12V to it, and the other connects to earth. If you earth the wire that has got 12V to it, the horn will sound.

The problem you've got is that the mk3 escort stalk has a common 12V feed to the horn switch, which is the opposite of what you need. You can get around this by adding a relay.

After you've added a new wire to the stalk connector (obviously as the standard horn was not on the end of the stalk, there isn't a wire in the connector, but there is a location for one), run this wire to terminal 86 of the new relay. Run a wire from terminal 85 to earth. Extend the original 2 wires that went to the slip ring to terminals 30 and 87.

hagar24

There is a wire in the connector on my XR that goes right to the pin on the MK3 stalk and it does send power when you push the horn button so I guess all I have to do is get the relay and wire.
Is it a horn relay that I should get or any relay??

The Rapid 1

Ye it will "sound" like pop crackle fizz bang

Steve

jon@work

iTrader: (5)

If you've got a wire in place already, then take what I've written with a pinch of salt - I based my reply on later sierras, so earlier cars may be different - work it out with a meter, should be easy enough

jon@work

iTrader: (5)

I agree it sounds counter-intuitive, but what I wrote is correct for later sierras. Earth the wire that is showing 12V, and the horn will sound. As I wrote, the horn relay is wired to be earth-switching.

The Rapid 1

You seem to be making hard work of this

You have found the two wires on a connector that go to the switch on the stalk yes.

Now you have two wires going up to the slip rings of the steering wheel yes.

Then just cut (or add to and you could use either the wheel or stalk buttons then) into them and as long as the wires from the stalk dont go anywhere from the terminal block put them two wires from the rings across the two from the stalk.
If the wires from the stalk go elsewhere just cut them off and then join the two wires from the sliprings.
You dont need any relays or get power from anywhere or go under the bonnet etc.

You have your original two wires from the rings and two contacts across a switch.

IF you only have one wire to the rings then put that to one side of the stalk switch and the other side of the stalk switch earth.

All the wiring and power is already in the car, ALL your doing is moving the switched posistion.

Steve

The Rapid 1

Cant agree, if you got a wire that is +12v and you put it down to earth it will go bang !

What you mean is the relay coil is positively fed and it needs the other side of the relay coil earthing to energize the coil and operate the relay.

Which would be done by one of the sliprings being earthed and when making the horn push earths the other switch wire which earths the relay and energises it.

Guessing you get some flow thru the coil showing a +ve voltage on it, but doubt it full 12v.

Steve

jon@work

iTrader: (5)

wrong (for a later sierra)

I've already explained above why it's wrong - twice

I've been there and done that and blown the fuses

hagar24

What do you mean???

jon@work

iTrader: (5)

Try it out on your car tomorrow (if your sig is up to date). All you'll need to do is remove the steering wheel and use a meter to identify which of the contcts has 12V to it. Earth this contact and the horn will sound. Have a little faith.

hagar24

Here is what I found the MK# stalk has an extra pin coming from it that goes right in to the plug from the XR where as the XR stalk does not have that pin, as for ground that has to be on another pin already but I don't know how to take the horn wires as they are now and connect to the MK3 stalk to make the horn button sound the horns from there because as Jon@work says when I put a ground to the hot side of the XR horn wire the horn sounds and the MK3 stalk sends live voltage when pressed so my problem is how to make a proper connection so that the horn sounds from the MK3 stalk.

hagar24

Wrong person

hagar24

this is a Canadian XR4Ti we are talking about and I have done it 7+ times and did NOT BLOW THE FUSE.

The Rapid 1

Na my sig about 4 years old now

Still not sure why this so complicated, a switch is a switch.
You already have one on your steering wheel (push) and you have one on your stalk.
Simply move the wires from your wheel switch to your stalk switch

The Rapid 1

Ok think I know what your saying now.
The extra pin on the MK3 stalk probably is neither + or - if not pushing the stalk horn function, but if you push the stalk horn button does it go -ve (to earth 0 ohms resistance)

Steve

jon@work

iTrader: (5)

As I said in my first post :

Take the horn wire in the stalk connector to terminal 86 of a new relay (this will feed 12V to the coil side of the new relay when the horn button on the stalk is pressed). Run a wire from terminal 85 to earth. Extend the original 2 wires that went to the slip ring to terminals 30 and 87 of the new relay, so that when the new relay coil is energised, it is the equivalent of pressing the original horn push, ie grounding the 12V from the original relay, which you will need to leave in place).

hagar24

When I have the MK3 stalk connected It shows power when pushed, when not pushed nothing there

DazC

iTrader: (1)

follow the advice from jon@work.

Use the stalk to feed a relay to then earth the horn wire when the relay switches.

hagar24

Thanks for the info I will do that today.

hagar24

Just want to say thanks for the info, my horn is now working from the MK3 stalk.
hagar24

jon@work

iTrader: (5)

happy to help