The indicators have stopped working on my 2003 izuzi trooper but the emergency flashers still work.

Most cars have 2 separate flasher modules, controlling turn and hazard function separately. To be on the safe side, turn on your hazards and make sure all 4 corners of the car have lights flashing. Once you know all your lights are good, check out your flasher module. The old, thermal style flasher modules (and some of the newer electronic ones) have contact points inside that wear out over time or become carbon caked so you'll hear the flasher trying to work but won't flash the lights.