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Why does my 85 Toyota Celica headlights come up but not on?

Potential causes:

- Faulty Headlight Switch:

- The switch that controls and controls the headlights may have failed.

- Blown Fuse:

- Check the fuse box to see if the fuse for the headlights has blown. Replace it if necessary.

- Relay Issue:

- There could be a problem with the relay that controls the headlights. Test the relay to determine if it's faulty and needs replacement.

- Wiring Issues:

- Check the wiring associated with the headlights for wear, damage, or looseness.

- Headlight Socket or Connector Issues:

- Examine the sockets and connectors that connect the headlights to the electrical system. Ensure they're free from corrosion and properly seated.

- Faulty Headlights:

- The headlight bulbs themselves could be faulty. Try installing a known working headlight bulb to see if that solves the issue.

If the issue persists or you're uncomfortable troubleshooting electrical issues, seek the assistance of a qualified auto mechanic or electrician. They can diagnose the exact problem and perform necessary repairs.