420 horns sounding intermittently

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BookerME
Posts: 46
Joined: Tue Jul 17, 2018 7:53 am

420 horns sounding intermittently

Postby BookerME » Sun Feb 10, 2019 1:09 pm

I’ve got a problem with the horns sounding intermittently while driving my 420.
It’s almost certainly a ‘short’ somewhere completing the electrical circuit.
It looks like I’ll have to take the steering column apart to get to the circuit/connections - and that would appear to be a complicated and fiddly job.

Before I venture down this route, has anyone got any experience with this problem and any tips as to what to do and where to look please?

Thanks, Mac.
Current vehicle. 2002 XKR convertible.
In recovery. 1969 Daimler 420 auto.
Previous outings. 1966 MKII 3.4 auto. 1966 3.8 S Type auto

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piman
Posts: 872
Joined: Mon Oct 29, 2007 7:32 pm
Location: Oswestry

Re: 420 horns sounding intermittently

Postby piman » Sun Feb 10, 2019 3:05 pm

Hello Mac,

I think I would first disconnect the horn earth where it comes out of the bottom of the steering column, for if it still sounds the column itself is probably OK?
However I think that the problem if it is in the column will be in the steering wheel so minimal dismantling. Should it be a wire problem withing the column, you should be able to fish a new length of wire in by attaching it to the existing and pulling the new one in?

This is going by a MK 2 parts book but I would think the 420 will be the same. Replacement cable is part number C15666

Alec
Mk 2 3.8 (long term restoration), MK1 Triumph 2.5 P.I.,2.5 X Type Estate, 564 Hymer Motorhome

BookerME
Posts: 46
Joined: Tue Jul 17, 2018 7:53 am

Re: 420 horns sounding intermittently

Postby BookerME » Sun Feb 10, 2019 7:55 pm

Thanks Alec...
Current vehicle. 2002 XKR convertible.
In recovery. 1969 Daimler 420 auto.
Previous outings. 1966 MKII 3.4 auto. 1966 3.8 S Type auto

PPV
Posts: 472
Joined: Sat Jun 14, 2008 4:48 pm
Location: Nantwich

Re: 420 horns sounding intermittently

Postby PPV » Mon Feb 11, 2019 10:41 am

Intermitant sounding sounds like a wire chafing somewhere unless the horn is always on but there is no connection until a bit of vibration connects it. I agree with Alec but would also check the wiring underneath/into the engine compartment where you can see it.
If the problem is not down through the column area then disconnect the wire at the base of the column and the horns and run a new line to the horns temporarily and see if that cures it. If so then it is a short on the way from the column to the horns.
Paul V
Mk2 3.8
Mercedes A45 AMG
Mercedes AMG GLC43

BookerME
Posts: 46
Joined: Tue Jul 17, 2018 7:53 am

Re: 420 horns sounding intermittently

Postby BookerME » Mon Feb 11, 2019 11:40 am

Thanks Paul. Yes, it’s vibration that’s completing the circuit somewhere.
I’ll take a look at the ‘external’ wiring before disconnecting anything. Then I’ll follow Alec’s and your advice for testing the connection between the column and the horns.
Current vehicle. 2002 XKR convertible.
In recovery. 1969 Daimler 420 auto.
Previous outings. 1966 MKII 3.4 auto. 1966 3.8 S Type auto


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