Xenon OEM Headlight Retro-fit Guide

I have recently performed the relatively simple task of upgrading my 2005 Mondeo from ordinary halogen headlights to the Xenon HID headlights.

Wiring Diagrams

The wiring diagrams for the halogen headlights are pretty simple, and show the connections to and from each of the pins on the 7-pin headlight connectors (C146 & C147):

It is worth noting that Fuses 16 and 18 (both 7.5A) have to be upgraded to 20A to support the xenon lights.

The wiring diagram for the Xenon HID headlights is a lot more complicated, but we only need very few details from it. Again, it shows the connections to and from each of the headlight connectors:

As you can see, there are a lot more wires going to the xenon headlights, most of these are for the automatic levelling system, which connects to sensors in the axles of the car to ensure the xenon lights remain aimed properly (to aviod blinding oncoming drivers). To get the xenons to work, this is not needed (the manual headlight adjusted can be made to control the xenons instead).

Headlight Connectors

Submitted by dazedconfused