in my 99 RS my left front blinker doesnt work. ive tried 3 different bulbs, all that work fine on the other side. so its not the bulb. i swapped the sockets, and the left one still doesnt work, so its not the socket. the left fender and tail blinkers both work, they just click at a faster rate.

could it be the wire harness? or just the flasher? or relay?

this is annoying, as left is more important than the right.

 

My bet would be the wiring. There's not a lot you can do except:

1. test that there is a good earth on the bulb connector.
2. test that current reaches the bulb connector.
3. Trace the wiring backwards from the bulb connector until you find the break/corrosion etc.

1&2 above need either a circuit tester, or a multimeter. Both relatively cheap.

Alcazar