I'm having a problem with my left turn signal. When I put the left turn signal on I get a rapid flashing and the front left turn signal blinks but the back does not.

I assumed it was the bulb so I removed and replaced the rear bulb. This did not fix the problem.

Is it possible/likely the flasher (turn signal relay) is bad? Would a bad flasher cause this problem?

I'm not really sure where to look next.

The right turn signal works fine.

Thanks for any help/pointers.