audiforglen

Hello, I am new to the forums and new to Audi. I purchased a 2007 A4 Avant Quattro a few months back. It's been great. But, just in the last week I had a turn signal issue. I figured, like in past cars, just replace the bulb. No doing it. From inside the car it blinks regular, but outside, the top bulb will flash on a split second, and the bottom won't go on at all. I have brought out my multi-meter and I can't seem to figure out what the pinout is, I tried cleaning the connectors with no change. I am at my wits end on this. The right side works fine. Any ideas?