Tail lights working only on sidelights?

[Bowie69]

Well it seems electrical gremlins are at work... for some odd reason when I have the column light switch in sidelight mode, the LH and RH tail lights work great, however when I put them in dipped or main beam the LH tail lights go off!

Any ideas? The lights were working perfectly, and I am not getting any voltage to the grey/black wire which I believe to be the tail lights, at least when in dipped mode.

I've seen on a schematic something to do with a lighting control unit? Where is this?

Cheers,

Pete.

[Bowie69]

OK, well found the tail light control unit, passenger side wing behind the carpet -not getting anything on the grey/black there at either input or output, grey/red is fine (RH side), so looks like the problem is further up stream.... I guess these wires run behind the 'door' panels in the rear of the car?

[Bowie69]

Beginning to think this is the stalk...

[Bowie69]

Yes, it is the stalk

*smacks head*

Contact cleaner has sorted it for the moment, only just replaced the other side!

Will replace if not too dear.

[fourringsrus]

Crikey mate, repairing and posting and sorting in just over an hour, well done.
Anyway, yep your switchgear/stalk is the problem as you have found, I had the exact same trouble on my '89 Audi 90 last year, used item cleaned up and fitted, jobs a good 'un

[Bowie69]

Cheers buddy

I did have a bit of a gloomy moment thinking I had snagged a wire when I replaced the rear speakers the other day.... fortunately not

Think I will buy a Febi one, the other side was only £35 I think, and at least they will both look new then, rather than one new one old...

[Bowie69]

Yup, £34 for a new one

[fourringsrus]

Result