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Hi. Since the headlight on the driver side is working then we dont have any problem with the fuse or relay. Check the wiring and the socket of the passenger headlight if it is intact to the bulb. If it is intact, then this could be a headlight problem. Time to replace the passenger headlight.
TEST remove both bulbs from the lamps but leave them on their wires switch
on and see if the bulbs are still different brightness if not they the
passenger side lamp housing has damaged mirror is dirty or missalined and needs adjustment. if they are
different brightness then this may be a earthing problem.
Unless the engine compartment in your '99 is drastically different from my '96, I disagree. I've changed both of my lamps and the battery didn't have to come out. You just have to take the headlights loose to gain access to the rear of them. The lamp holder just unscrews and pops right out. If nothing else, pick up a Haynes or Chilton manual for your car. It has exacting instructions on how to change the lamp. For what it's worth, If your headlights are hazed over like many older cars, don't buy the exact factory replacement lamp. It' won't be bright enough. Buy a higher lumen bulb.
There are no screws need to be removed from the headlight bezel as the lamp need be only removed from the rear. On the rear of the headlight unplug the wiring harness, then turn the big hand screw /catch only 1/4 turn and pull out the socket and lamp straight out. then replace the burnt lamp and do the reverse of which you did to get it out.
As with most auto headlights, you will access them from within the engine compartment.
There will be a wiring harness that plugs into the back of the lamp. Be careful not to damage the locking clip that holds the wire firmly onto the lamp. Move the harness out of the way and grasp the connector portion of the lamp and twist COUNTERCLOCKWISE to release the lamp from the housing, and plug the bad lamp out.
When installing the new lamp, be sure NOT to touch the glass lamp as the oils from your skin can damage the bulb by creating a 'HOT SPOT'. As a rule of thumb and good auto maintenance you should ALWAYS replace both lamps at the same time. Headlamp bulbs deteriorate over time and will get dimmer as they age. Why get dirty twice when you can do it just one time. Besides most lamps are sold in MATCHED pairs so the intensity will be the same for both the left and right sides of the car.
There is 2 plastic clips behind the headlight, lift these up and pull the headlight out. Then just twist the plastic cap out of the headlight and replace. (Do not touch the bulb when replacing). Then put headlight back in all the way and slide the plastic retainer clips back into position.
just changed headlight out in my 86 300zx today. have to have headlights up. there is a casing around the lights (highlight/fog), screw on each side that has to be removed. bottom of casing snaps out... then you have to unscrew the screw that is on top side of lamp and on the inside of the lamp (inside meaning towards middle of car) enough to get headlight out of posiiton, but don't forget you have to unplug the wiring from the back of the headlight from the back of the lamp.. thru under the hood... i know clear as mud right.. :) then change out lamps and put back together... :)
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