From Matthew Wright,
Your Guide to Auto Repair.
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Turn signals are one of the easiest systems in your car to troubleshoot, well usually they are. Your signal flashers either work or they don't. It's kind of like being pregnant - there's no such thing as "sort of." Troubleshooting your turn signals isn't tough. If your turn signals have stopped working, it'll be doing one of these things: blinking rapidly, coming on without blinking, or nothing at all. The good news is that all of these symptoms point to two possible issues, a bad turn signal relay or a dead bulb. If the signal blinks really fast, you have a bulb out on that side. If it doesn't come on at all, or doesn't blink, you'll need to replace your turn signal relay. Your turn signal relay is easy to replace, and they are almost never expensive.

If your turn signals aren't doing the job, and you're ready to replace your turn signal relay, read on.

*Some vehicles have separate flasher relays for turn signals and hazard lights. Be sure to check both systems while you're thinking about signal relays. Hazard lights can be very important.