I have a 2003 st170 and to replace my bulbs you have to release the flaps on the back of the light by pushing the metal clip down. remove the cover completely. on the bulb will be a metal clip i think if you push the end which will be towards the wing of the car down and then it will swing towards you and release the bulb. remove bulb and replace with new. try not to handle the bulb with your bare skin use a tissue to handle it with. when fitting the new bulb make sure you get the groove in the bulb inline with the one in the housing this way the bulb will sit in the correct position its easy enough.
repeat for the opposite side... im not sure about your car but with the st170 you have to remove the battery in order to replace the drivers side bulbs.
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Ensure that the headlights on your Ford Focus are off by checking you have turned the headlight control all the way to the off position. Make sure your car is off and the keys are out of the ignition, so the daytime lamps are also off.
Open the hood using the hood release handle located inside the vehicle under the steering wheel on the left side of the instrument panel. Walk around to the front of your Ford Focus and release the auxiliary latch located under the front of the hood. Lift the hood and secure it in place with the yellow end of the hood's strut in the designated holes.
Locate the bulb cover found just behind the headlight assembly and remove it by turning it counterclockwise. Swivel the wire clip that hold the bulb and connector in place out of the way by turning it to the left.
Pull out the headlight bulb with its electrical connector straight out from the headlamp assembly.
Disconnect the bulb from the connector. Later editions of the Ford Focus may have a retaining ring that lies between the bulb and electrical connector. Simply remove this retaining ring by twisting it off with a counterclockwise turn.
Install the replacement headlight bulb in reverse order of removal. Use a HB2 replacement bulb for models older than 2004 and a HB5 bulb for models produced since 2005. Replace the wire clip and bulb cover, as well.
Turn on your Ford Focus and check that the headlights are working properly after closing the hood.
Lights not adjustable? Hmmm. Is this because the adjustment mechanism is seized or they just didn't want to do them? According to the manual they are adjustable. It is also possible the reflective quality of your headlamps has been compromised by moisture and time. Can you look behind the bulbs in your car and see where the mirror type surface has turned dark or peeling? Common in the lamp assembly's made in recent years. Installing a brighter bulb without a good reflective surface is a waste of money. Also common is the outer plastic surface getting pitted and yellow. There are kits available in auto supply shops that do a decent restoration on this problem.
Your adjustment screws should be white nuts (adjustable with an allen wrench, or a socket, or a pair of pliers) located behind the headlamp assembly right up against the fender
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall. You only need to do this and the aiming for your low beams as your high beams are on the same bulb
Your headlights should also say VOR. When you turn on your headlights, aim them right at the mark that you put on the wall, with the brightest cutoff directly under the mark
i would take another look at the connector that goes to the bulb thats not working, if the contacts are burnt or have a green pwder like substance all over them you should replace the connector. hope this helps you and good luck!
The replacement bulb for the headlight in you Focus is a 9003. There are several variations to this number though. For example GE/Sylvania has a 9003CB--CB standing for "Cool Blue", 9003XV--XV standing for Xtra Vision, etc. Hopefully you plan on replacing both bulbs when you go to do so. You lights will not look like you have one old bulb and one new bulb and you won't have to worry about it going out on you at a bad time and costing you a traffic ticket. Hope this helps and have a great day!