Xenon question

[rstoughy]

Sorry it's about my daily drive Audi but i'm not a member of any Audi forums to ask this question on

Its an older D2 model S8 year 2000. (same as the one in Ronan)

Problem is that with ignition turned on (car not started) when the headlights are switched onto the dipped beam the O/S takes about 4sec longer to come on than the N/S.

If i then turn the key to start the car both lights go out (as expected) but only the N/S will then come back onto dipped beam.

Same situation if the cars running and the headlights are swiched on, only the N/S works.

Bulb is fine as it works with car not running.

Everything else works as normal eg side lights, full beam and front fogs.

Ballast?
Igniter?
Whats the difference between the two or are they the same thing as in contained in the same housing?

Hope thats clear