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Old 17-06-2015, 09:01 PM
big rex 2 big rex 2 is offline
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Horn ground wire location

Hi guys ,

Can anyone tell me where the steering column grounds to the body?
I have tracked my horn problem down to a bad ground wire.

After much head scratching I found both my horns were rusted solid and the relay was wired up in the wrong order. This is the final hurdle ......

Cheers,
Adam
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Old 17-06-2015, 09:59 PM
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if the steering column ground is bad would that not effect other things .try a better earth at the horns first.
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Old 17-06-2015, 10:16 PM
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When I had a bad steering column ground it affected my horn ( ) and my flashing power ().
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Old 17-06-2015, 11:07 PM
big rex 2 big rex 2 is offline
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Everything is now spot on apart from the horn switch , I ran an earth from the dash bracket and it works perfectly when touched against the copper/ brass brush on the back of the wheel so it had to be a bad ground at the column surely ?

I know what you mean ,Rob I was thinking other items wouldn't be working but they are all fine and dandy.

Loosing the will to live here , this is the only thing standing between me and an mot . I even got tempted to wire in a switch but I really really don't want to do .
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Old 17-06-2015, 11:37 PM
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Ok Heath Robinson fix - undoubtedly you've considered this already- how about wiring up an earth to the brass brush as a temp fix for mot and taking your time with it later?
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Old 18-06-2015, 10:38 AM
big rex 2 big rex 2 is offline
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I'm tempted to that but I really don't want to do a Heath Robinson , I want my new nardi wheel centre to work :-) .

It may come to this though just to get the ticket .


Rob how did you fix your bad ground ?
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Old 18-06-2015, 10:39 AM
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If adding an earth to the brass bit solves the problem, surely all you need to do is follow the existing wire from the brass bit and check for continuity along it and earth where it ends? or am I misunderstanding?
Or indeed as Ali says: if adding a 2nd earth wire resolves it, why worry? it'll be invisible inside the cowl /dash and is hardly a significant loss of originality in any case.
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Old 18-06-2015, 10:57 AM
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Quote:
Originally Posted by big rex 2 View Post
..............Rob how did you fix your bad ground ?
I think I just 'ground' the column with a wire - it was about 10 years ago. I know that you would expect the column to be 'ground' already but it worked for me.
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Old 18-06-2015, 11:39 AM
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Horn "ground" is at the bracket of the horn itself and live supply is from horn relay. Column horn push switch grounds the live supply to the horn relay.
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Old 18-06-2015, 11:51 AM
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Quote:
Originally Posted by big rex 2 View Post
Everything is now spot on apart from the horn switch , I ran an earth from the dash bracket and it works perfectly when touched against the copper/ brass brush on the back of the wheel so it had to be a bad ground at the column surely ?

I know what you mean ,Rob I was thinking other items wouldn't be working but they are all fine and dandy.

Loosing the will to live here , this is the only thing standing between me and an mot . I even got tempted to wire in a switch but I really really don't want to do .
Maybe it's something to do with the hub adapter you're using?
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Old 18-06-2015, 03:26 PM
big rex 2 big rex 2 is offline
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Quote:
Originally Posted by Mr.F View Post
Horn "ground" is at the bracket of the horn itself and live supply is from horn relay. Column horn push switch grounds the live supply to the horn relay.
So for me to test this , if I extend the wire for the push switch and touch it on the brass "brush" would the horn sound ?



cheers guys your help is appreciated.
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Old 18-06-2015, 03:36 PM
big rex 2 big rex 2 is offline
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By "testing this" I mean testing the ground of the column.
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Old 28-09-2017, 08:25 PM
Paul Henley Paul Henley is offline
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Horn Issue

Hi All
Jumping on the back of this thread as I searched as it's exactly my problem and is driving me nuts. Everything works and is correct, the horns, the relay and all associated wiring. I have 12v to the centre of the horn (the black ring crimp that screws into the horn switch (via the brass arm that is fed from the relay, see pic) As I said everything works including the horn switch but the centre of the steering shaft is not earthed, therefore the relay doesn't switch 12v to the horns. If I short the 12v at the horn switch everything works hence the comment that everything works. So how is the Steering Shaft earthed? Am I not seeing the wood for the trees?
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Old 28-09-2017, 11:36 PM
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Run a ground earth wire to the steering column see if the horn works then ,you would expect the column to be earthed where its bolted but maybe the paint on the car is stopping proper earthing .Good luck .

Derrick
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Old 29-09-2017, 08:01 PM
Paul Henley Paul Henley is offline
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Hi, Derrick, yeah that's what I did last night, ran a wire from the black ground wire that feeds into the combination and wiper switches on the steering column and into one of the bolts that clamps the steering column hub together. Everything works as it should and defeats the problem but would be nice to have it "as it should be". I'm with you on the paint theory, I don't recall a specific ground on the steering when I took it apart so I'm guessing the paint is insulating the column from the bulkhead..
Thanks for your reply,
Paul
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