If the low beam on your Bajaj Pulsar 150 is not working despite the filament being intact, there could be several potential causes for this issue. Here are a few possibilities to consider:
Faulty wiring: Inspect the wiring connections leading to the low beam bulb. Look for any loose connections, frayed wires, or signs of damage. If you find any issues, you may need to repair or replace the wiring.
Blown fuse: Check the fuse box to see if the fuse for the low beam has blown. Replace it with a new fuse of the correct rating if necessary.
Faulty switch: The switch responsible for controlling the low beam might be faulty. Try operating the switch a few times to see if it makes any difference. If the switch is malfunctioning, you may need to replace it.
Defective relay: There could be a problem with the relay that controls the low beam. Relays are responsible for routing electrical power to various components. A faulty relay can prevent the low beam from functioning properly. Consider checking and replacing the relay if needed.
Dimmer switch issue: In some motorcycles, there is a dimmer switch that allows you to toggle between high and low beams. If the dimmer switch is malfunctioning, it could be the reason for the low beam not working. Inspect the dimmer switch and replace it if necessary.
Voltage regulator or rectifier problem: If the low beam is not receiving the correct voltage, it may not function as expected. The voltage regulator or rectifier could be responsible for this issue. It may require testing or replacement by a professional.
If you have checked the filament and none of the above suggestions resolve the issue, it might be best to consult a professional mechanic or take your Bajaj Pulsar 150 to a service center for a thorough inspection and diagnosis. They will have the expertise and necessary equipment to identify and rectify the problem accurately.