These are installed per the instructions. They worked for years. Now, nothing. I checked the in-line fuse in the engine bay in front of the driver seat. I took a close look at the lamps and the filaments look good. I checked the connections at the switch in the driver's foot-well. I wiggled all the wires I could reach. Any other suggestions?

 

The filaments looked good, but did you check the actual voltage of the wires at the bulbs or the continuity of the switch with a multimeter? Also, did you have your high beams on when checking the lights? Just trying to rule out some simple stuff before you dig deeper.