my Toyota RAV4 headlights keep flickering when driving what could be the issue

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Tools Required: Socket set, multimeter, wire brush, OBD-II scanner.

2. Inspect and Replace Headlight Bulbs

• Remove the headlight assembly by unscrewing the retaining screws.
• Disconnect the bulb connector and carefully remove the old bulb.
• Insert the new bulb, ensuring it is properly seated.
• Reconnect the bulb connector and reassemble the headlight assembly.

3. Clean Battery Terminals

• Use a wire brush to clean the battery terminals and cable connectors.
• Apply a thin layer of petroleum jelly to prevent future corrosion.
• Reconnect the battery terminals securely.

4. Test and Replace Alternator (if necessary)

• Using a multimeter, check the alternator output while the engine is running.
• If the voltage is below specification, remove the alternator:
  • Disconnect the battery.
  • Remove the serpentine belt.
  • Unplug electrical connectors and remove mounting bolts.
  • Install a new alternator and reconnect all components.

5. Inspect Wiring and Connections

• Visually inspect wiring harnesses for signs of wear, fraying, or corrosion.
• Repair or replace any damaged wiring or connectors as necessary.
• Ensure all connections are tight and free of corrosion.