I have a 2010 STX with a lighting issue. My lower left tail light only lights up briefly when unlocking with the remote and goes out while the others stay on. It also happens when I turn the parking lights on. It seems to work fine with the blinkers and brake. I've changed the bulb with a known good one, a new one and a new LED all with the same result. If anyone has experienced something like this, any assistance would be greatly appreciated!

 

Welcome to the forum.

Check the bulb socket for a loose pin or corrosion. Spray it down with contact cleaner, and make sure the bulb is making a good connection. Check the ground points back there. Follow the wiring down under the truck and up the frame to check the status of the grounds.