Changing the dipped beam bulb on the old Mk1 Ford Focus can seem daunting, and I have read different ways of doing it. The near-side (kerb-side) bulb is a particular challenge due to the proximity of the battery and A/C.
This is the way I was shown by a Ford engineer, and when you have done it once it is very quick and easy.
It involves removing the headlight assembly. The main obstacle is the retaining bolt under the car!
Step 1: Purchase Bulb
My local car hardware chain store seemed insistent that the Mk1-facelife (Mk 1.5) Focus has H4 bulbs (dual filament) but this was not the case. The Mk1.5 has a separate main beam and this means it is a H7 dipped beam bulb that is needed.
Step 2: Undo Top Headlight Unit Bolts
Wait for a dry day, unless you have a garage.
Tools needed - ratcheting socket wrench, 10 mm socket, and an extender piece.
Open bonnet and secure.
Remove the two bolts on the headlight unit as shown in the figure using the 10 mm socket wrench. One is at the top corner, and the other half way along the top of the headlight.
These bolts and the one under the car you will soon remove are identical. They are not the same as the ones from the grill plastic trim however, which also need removing, so don't mix them up...
Step 3: Remove Bolt Underneath
The final retaining bolt is located under the car, you have to get your arm up under the plastic trim in front of the wheel arch. There is a 'tab' that protrudes down from the bodywork, through which a bolt attaches to a similar tab in the headlight assembly. You may need to put down a mat to lie on, and get under the car, but once familiar you can do it by touch. You will need to use the standard length socket (no extender piece this time) due to the tight space.
This is the most inconvenient bit. I can only assume a deliberate act by Ford to encourage people to visit a dealer. Newer designs have done away with this. In fact, I have not bothered to put this back in, the unit is perfectly secure on the top two bolts.
Step 4: Loosen Plastic Front Grill
This is necessary to allow the headlight assembly to be removed.
It is only necessary to loosen one side of the grill (the side where the headlight is you wish to remove). It is possible to remove it entirely if needed.
There are plastic arms with clips that come off by pulling up. Loosen one of these (or both if removing entirely). Unscrew and remove the bolt and washer - this is deep down and you will need the extender bit of your socket set.
Once the grill is loose, you should be able to lift the headlight unit away. It will now only be held on with the power connector.
Note this screw is different to the others on the headlight so don't mix them up.
Step 5: Remove Power Lead.
The headlight is now only held in by the power connector. Push a flat screwdriver in the clip on the power connector and it will pull off (may be a bit tight). Take the headlight to a working area. Push down metal bar to release the back cover, and remove it from the hinge slots. Note which way around it went on.
Step 6: Remove Headlight Back Cover
You can now take the headlight unit to a suitable working area.
Push down metal bar to release the back cover, and remove it from the hinge slots.
Step 7: Remove Old Bulb
A sprung metal clip holds the bulb in. It passes over the bulb and connector. This is pushed down to release it from the notch that holds it in. The loop of the clip passes over the black square bulb connector and wire. Pull the old bulb off the black connector. Leave the wire and black connector through the metal loop. Safely discard the old bulb.
Step 8: Fit New Bulb
Take the new bulb by the metal housing – do not touch the glass. Attach to the square black power connector which should still be passed through the metal clip loop. Now place the bulb in the headlight.
Align the bulb with the slots in the unit – it will only fit one way. Once sat correctly, hold in place with a finger whilst closing the metal retaining loop. If this requires a lot of force, the bulb is not sat correctly!
Step 9: Test the Bulb and Reassemble
Test the bulb before reassembling the headlight, to make sure it works.
Reattach the rear plastic cover to the headlight. Don't forget to do this! (as I have)
Site the headlight unit back on the car. It may need some wiggling to get it to slot in right (this is the 'tab' that goes under the car that needs to be positioned right).
Attach the power lead. Attach the three bolts for the headlight (or two, if you are leaving the one off that is under the car, as I have).
Clip the grill back on and put the bolt and washer back. When tightening that bolt, don't catch the lip of the plastic under the washer, push it out of the way.