Audi 80 b4 headlight question

[sjp001]

Hi all,

I'm afraid I know very little about electronics, but any help would be appreciated...

Basically one night both headlights on my b4 audi 80 tdi went out on dipped beam, but the side lights and full beam were fine. Fuses were fine. So I bought a second hand switch (steering column one with the stalks for indicators and lights) and the lights were fully functioning again. Less than a week later and I've lost dipped beam again. Any thoughts? Is there a relay for the lights somewhere, as I can't find any info about where it is but presume there must be one somewhere. I assume there will be one in the area behind the drivers side parcel shelf thing. Also I suppose it could be possible that the switch has failed as it was second hand?

Thank you very much in advance for any help!