No Horn

[Marto]

HELP! MOT on Thursday and it's decided to pull this stunt.

Simply...I have no horn (and no..not me, and not a medical condition!!!) Followed the bible advise...cleaned up the contact at the steering wheel. Checked the horns themselves and cleaned the contacts, both are OK. Checked the relay remotely, it's clicking OK.

So seems to be from the steering wheel to the relay, as there is no clicking noise when I push the horn.

The car is a '93 Griff, with what seems to be a '98 relay set up/ fuse box according to the bible.

All help appreciated.....

Thanks

Marto..

[GJR]

I'm guessing you've already checked the fuse but if you have a 98 Griff 500 fuse box and the horn fuse is 15A you could try switching the fuse for another 15A (eg. from the main or dipped 15A ).

Does the cigar lighter work? According to the bible they are on the same fuse..

I've read on here that sometimes fuses can have hair line fractures that can stop them from working even if they don't appear to have blown.

Other than that?? bad joints? bad relay?

I'm sure someone else with more insight wil be along soonn

G

[medieval]

Viagra?

[Marto]

There's always one...isn't there!

;-) Marto

[GJR]

Oh... there's more than just one on here !?!!??

G

[spend]

I dont quite understand what you have tested? - It is early for me

If you link across the 2 parallel contacts of the relay socket - does the horn sound?

One of the other 2 relay sockets should have 12v - the other will be grounded via the horn push. Check the 12v. Put relay back & trap a wire into the other terminal - touching this to ground and horn sounding will confirm your diagnosis.

Can you see this 12v at the steering column (there is a connector at the back of the cowl IIRC) - touching this to ground should sound the horn.

Is the steering column Earthed?

Dave

[Marto]

Thanks lads...A few additional things to try there. I'm more of a nut and bolt man than a wire and crimp man!!

I haven't checked the earthing point at the back of the steering wheel cowl. Where is that located precisely?

I should also state in the 10 months of ownership, it has worked on 2 occasions...would this narrow down the options?

Marto

[spend]

IIRC normally some black wires from the dash area fitted to the U clamp just behind the cowl. You can see if the earth is ok measuring resistance from a good known earth (like cig lighter socket) to the column mounting bolts with a multimeter.

Dave

[Aussie John]

Just been through this myself, after a lot of bu**ering around it turned out to be a bad earth on the horn button itself, the wire on the side of the button needed pulling out a bit to be tighter against the steering wheel boss, worth a look. John.

[Marto]

Thanks to you all lads, your help has been much appreciated!

I connected the wire coming from the s/wheel contact to the earth stud and a joyfully big parp was noted. So much so, I gave it large for a minute or so, such was my excitement!!!!!!

Anyway, I've have obviously narrowed it down to the steering wheel button / contact. I have given the contact area both on the streering whell and the sprung contact a going over with emery and that has not cured it.

I cleaned up the earthing on the bolt under the steering wheel....no.

I nipped out the button on the wheel. All we seem to have there is a spring and a circular brass coloured plate.

So where can I go from here.....

Cheers

Marto

[Aussie John]

Have you cleaned the brass bit in the button? Pull the wire bit on the side of the button to let it jam a bit tighter to the wheel, cheers John.

[Marto]

OK John...I'll give that a spin tomorrow and see if that works.

Ta

Marto

[griffter]

From what I can gather everything's working except the horn switch, with the wheel and boss in situ?
On my car the sprung brass pin mounted above the steering column had worn down and was no longer making good enough contact with the brass ring on the steering boss. The solution was to solder a short length of tube (a bit of an electrical connector actually) to extend the pin and then get a blob of solder on the end of the tube - the blob then contacts the ring on the boss. If you take the boss off you'll see what I mean.

[Marto]

SUSSED IT!

Thanks to you lot that replied. It looks at if the culprit was the spring in the wheel boss not making contact with the body of the steering wheel to give an earth.

Thank Christ for that!!!

[spend]

Tut! TVR wiring falsely accused again

B100dy components

Dave