So i have a 2000 a6 2.7t. Now what happened is, the right rear running light went out, so i replaced it. its still not working. and now what happened is the whole left side running lights don't work.... And my gauge cluster won't light up now.

i checked the fuses. no problems.
i checked all lights. no problems.

What the hell is happening to my car??!!!
Thank you for any help guys.

 

Please be more specific!
When did the cluster go out? before or after you changed the light?
How did you check the fuses?
Which running lights are you talking about? side marker, tail, ????

 

i would say you have a bad body ground.

edit: has the car ever had any aftermarket electronics installed?