* Bulbs: A single burned-out bulb in the turn signal circuit can cause the signals to blink rapidly (hyperflash). This is because the system detects a lower-than-normal load.
* Turn signal switch: The switch itself might be malfunctioning, causing intermittent or erratic blinking.
* Wiring issues: Corrosion, breaks, or loose connections in the wiring harness can disrupt the signal flow.
* Hazard flasher: If the hazard lights work normally but the turn signals are erratic, the problem likely isn't the flasher unit itself. However, if *neither* work, then the flasher is a suspect.
* Turn signal relay: Similar to the flasher, a faulty relay could cause erratic blinking.
To troubleshoot:
1. Check all the bulbs: Start with the easiest check. Replace any bulbs that are burnt out. If the problem goes away, you've solved it.
2. Check the fuses: Locate the fuse(s) related to the turn signals in the fuse box (consult your owner's manual). Check for blown fuses (broken filament).
3. Test the hazard lights: If the hazard lights work normally, it suggests the flasher and wiring are likely OK.
4. Inspect the wiring: This is the most difficult and requires some electrical knowledge. Look for any obvious damage, corrosion, or loose connections in the wiring leading to the turn signals.
If you've checked all of these and the problem persists, you'll likely need to take your car to a qualified mechanic for diagnosis and repair. It's possible there's a more complex electrical fault.
