|These headlights have seen better days.|
|Water and dirt were entering through this hole.|
He wanted a solution for his poorly performing stock lights, and our Bosch European H4 headlights were the answer. The H5 headlight as found on US-market 911's is a sealed unit, with a plastic housing that was prone to melting and damage. The European H4 headlight has a metal housing, and can be disassembled if you need to replace just the lens. The Euro H4 headlight assembly also has superior light output due to it's lens construction.
|Bosch European H4 Headlight Assemblies are the popular upgrade from stock USDM H5 lights.|
Fortunately, replacing the tired H5 headlights with the better European H4s is a simple process. If you have a pre-1987 911, all you need is the H4 headlight assembly and an H4 bulb; if you have an 87-89 911, the bulb sockets are different, so you will need either an inexpensive "repair" harness to convert your wiring to an H4-compatible socket, or make an adapter to bridge between the stock H5 socket and H4 bulb.
|This screw is what holds the trim ring in place. Make a note of the angle the screw attaches to the tab inside for when you install the new headlight.|
|The headlight rings on this car had not been removed in a very long time, so we had to coax it off.|
|With the trim ring removed, you will have access to the 4 screws that need to be removed to remove the entire headlight assembly.|
|After the 4 screws are removed, the connector can be removed from the headlight, and the old headlight can be removed completely.|
With the ring removed, you can see the 4 screws that attach the headlight retainer to the car. Remove those 4 screws, and the entire headlight assembly can then be removed. Make sure to pull the headlight out enough to be able to detach the headlight from the stock harness before completely removing the headlight.
|1987-1989 911's use a different headlight connector than older models, requiring the need to convert to an appropriate connector.|
|Converting to the correct H4 connector is a simple process. Only 3 wires per side.|
Of note: the owner had us use Hella 55/60W H4 bulbs for his car, which do not require any upgrades to the stock wiring harness, as they the same wattage as stock. If you want to use a brighter/more powerful bulb, it is highly recommended to use an H4 relay harness to prevent any potential problems that may occurr when using a higher wattage bulb with stock wiring.
Install the new H4 bulb into the H4 assembly, making sure to not touch the glass of the bulb itself (the oils from your skin cause hotspots on the bulb during use, significantly decreasing it's lifespan).
|Install the new H4 bulb into the housing, and then attach the headlight connector.|
|It may take a few tries to get the new headlight aligned in the fender properly.|
|Adjust the aim of your new headlights using the two adjustment screws on either light.|
Once you have both headlights installed, all that's left to adjust your headlamps so that you get proper coverage when the lights are on. There are two adjustment screws on the other ring that allow you to do it easily.
And that's it. A quick and simple upgrade to your car that will greatly improve your driving safety at night.