Turn signal will not flash fuse is good where is the flasher located on an a4 turbo Audi 2000?

The turn signal flasher relay is on a circuit board inside the emergency flasher switch assembly. The relay contacts get pitted from electric arcs created every time they open - the flashers go intermittent, then stop working altogether. The emergency flasher itself uses a different relay, so it's usually unaffected.

Buy a new emergency flasher switch assembly (c. $60) - used will have the same problem. The new switch will have 10 contacts instead of your 9, but is interchangeable. It has a new enclosed relay and redesigned circuit, so I bet it won't pit as fast.

1. Gently pry the trim panel straight off (bottom first) - if you break off a clip or two, reglue with toluene cement (airplane glue).

2. Compress the spring clips on the left and right sides of the switch by pushing flat, stiff, thin tools through the L and R openings in the switch bezel and squeezing the tool tips inward. I used two small screwdrivers.

3. Pull the switch straight out and tie a long string around the cable so you can fetch it if it slips back. Seriously. You'll thank me for this. Go get the string right now.

4. Squeeze the connector's L and R tabs together and pull it off. See how the cable slips back into the hole? Aren't you glad you tied that string around it?

5. Snap the connector on the new switch. Untie the string. Press the new switch into the hole until it clicks. Push the trim panel back on, top first but as straight as you can manage it. You may need to massage the surrounding vinyl into place around the trim panel -- use plastic tools and be very gentle.

6. Test both the turn signals and the emergency flasher. If the flasher doesn't work, you blew the fuse (they're separately fused because the flasher is always powered but the signals are ignition-switched).

Just FYI, you can repair the switch if you have the tools and time -- fiddle apart the switch, desolder the relay from the card, and burnish the contacts with a contacts file or stiff piece of sandpaper. Test continuity from the common to each contact as you close the relay (manually is OK). Once it works, resolder, reassemble, reinstall.