DCox10

A few days ago the right side ( passenger) headlamp on our 2008 Audi Q7 stopped working. I replaced the low and high beam bulbs but the lights still did not come on. I checked the fuse box but no fuses had blown. Then I tested to see if current was flowing to the headlight assembly. I couldn't detect any current. The left side lamp and all turn signal lights etc. are working fine. Any suggestions about what else I should check before taking the car to our Audi mechanic would be greatly appreciated.