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Bulb may be no good as in headlight bulbs one filament can go leaving only either low beam or high beam operational on one headlight so change the bulb first on that side other than that could be power related
The headlight bulb has two elements. One works with high beam and the other works with the low beam. The low beam element is broken/fused. You have to change the headlight bulb in this case which is available at any of the auto spares shop.
Just open the hood and remove plug behind headlight and then turn plastic lock ring counter-clockwise. Make sure not to touch the new bulb with your finger`s-the acid on your skin will shorten the life span of the bulb. Bulb should cost you $10-15.
Removal & InstallationTo Remove: WARNING The halogen fog light bulb contains gas under pressure. The bulb may shatter if the glass envelope is scratched or if the bulb is dropped. Handle the bulb only by its base. Avoid touching the glass envelope. NOTE: The headlight bulb should not be removed from the headlight assembly until just before a replacement bulb is installed. Removing the bulb for an extended period of time may affect headlight bulb performance. Contaminants may enter the headlight assembly where they can settle on the lens and reflector. Never turn on the headlights with the bulb removed.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
NOTE: Make sure that the headlight switch and the ignition switch are in the OFF position.
Remove the pin-type retainers, screws and the air deflector from the radiator.
Remove the three bolts and the headlight assembly.
Disconnect the electrical connector.
Remove the cover from the rear of the headlight assembly.
If equipped with HID, release the spring tabs to remove the low beam bulb, otherwise disconnect the electrical connector and remove the bulb.
Disconnect the electrical connector and remove the high beam bulb.
HID low beam headlight bulb
Standard low beam headlight bulb
High beam headlight bulb
Place the headlight assembly in the proper position.
Install the cover from the rear of the headlight assembly.
Connect the electrical connector.
Install the three bolts and the headlight assembly.
The headlight on an 03 baja are a double element bulb for high an low beam. I replaced mine with 9007 bulb from auto parts store. Be careful to pay attention to bulb position, they can be installed up side down having the high beam as your low beam. I would shine the lights up against a wall or garage door and flip your high and low beams on and off to see how the shine.
The same bulb in a lot of applications controls both the high and low beam. Generally the low beam portion will burn out and for a short time you will be able to use the high beam only. I can't be certain which headlight switch that you checked, but the most common solution is to replace the headlight bulb. The bulb is on the inside of the headlight lense and is accessible by opening the hood and peeling back the rubber cover that covers up all of the headlamp apparatus. Depending on the model of vehicle they are mounted in there differently. Make sure and change both at the same time. It is generally cheaper to purchase new headlight bulbs as a (2) pack and it never fails if you change one the other will burn out in a week. Hope this helps