If your Thunderbird 350 BS4 model projector headlight is not working properly, there could be a few possible reasons for this issue:
Faulty Bulb: The first thing to check is the bulb itself. It is possible that the bulb has burned out or is not properly seated in its socket. Inspect the bulb for any signs of damage or discoloration. If necessary, replace the bulb with a new one and ensure it is securely installed.
Loose or Damaged Wiring: Check the wiring connections going to the headlight assembly. Loose or damaged wiring can result in intermittent or non-functional lighting. Inspect the wiring harness for any signs of fraying, loose connections, or corrosion. Ensure that all the connections are secure and properly plugged in.
Fuse Issue: If the headlight is not receiving power, it could be due to a blown fuse. Locate the fuse box in your motorcycle (usually located under the seat or near the battery), and check the fuse related to the headlight. If the fuse is blown, replace it with a new one of the same rating.
Faulty Switch or Relay: The headlight switch or relay may be defective, preventing proper power flow to the headlight. Test the switch and relay using a multimeter or have them checked by a qualified mechanic. If found faulty, they may need to be replaced.
Electrical System Issue: If none of the above solutions resolve the problem, there could be an underlying electrical issue with the motorcycle's wiring or electrical system. This may require a more in-depth diagnosis by a professional mechanic or service center with expertise in motorcycle electrical systems.
Given that your Thunderbird 350 is relatively new, it's advisable to reach out to an authorized Royal Enfield service center. They will have the expertise and knowledge to diagnose and resolve the issue under warranty if applicable. It's always best to consult a professional for accurate troubleshooting and repairs to ensure the problem is resolved safely and effectively.