PassionFord - Ford Focus, Escort & RS Forum Discussion - View Single Post - MK4 (Lx) Front Fog lights installation
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Old 12-01-2019, 06:29 PM
Join Date: Jun 2018
Location: Bristol
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So after millions of months later I finally installed the front fog lights and its relatively easy to do!

The main issue I had was the fog light switch is only connected to the ECU and there's no fog light connector at the front. There was one connector on the driver side of the car which fitted the fog light connector but this is NOT for fog lights and is part of the A/C system.

At the fog light switch-end there was a purple connector, but its not connected to any relay. However, its connected to the main ignition relay and the dashboard lighting, which will provide enough current to drive a relay coil....not the fog lights!. I spliced 2 switch cables and connected a relay coil (PA66-6F25) in parallel, wiring up using spade type crimps (the red ones) as shown below:

Fog Light interior switch (Pin 1 - Orange) to Relay Coil (Pin 1 - Orange)
Fog Light interior switch (Pin 4 - Black) to Relay Coil (Pin 2 - Black)

When the fog light interior switch was pressed, the relay would click! I placed this arrangement behind the radio for ease of access, make sure no conductors are exposed!

The second part was to route a 20A cabling from the battery to the inside of the car, along with 2x 10A cables which will connect to each fog light, providing a +ve voltage. By following this video, I was able to do this without destroying the car or drilling!
(from 1:28)

I connected the 20A cable to an in-line blade fuse housing and fitted the appropriate fuse (ideally to match your lights, but I used a 25A fuse as I know the cabling will not melt at this current draw). I connected the other end of the in-line blade fuse housing to the relay coil (Pin 5) using a spade type crimp (a yellow one).
I took the two 10A cables and binded them together by crimping them into another spade type crimp (a yellow one) and plugged it into the relay coil (Pin 3).

Under the bonnet there is a cable tray on the right, I placed the two 10A cables through that, I terminated one 10A cable to one fog light using a spade type connector (a blue one) and terminated the second 10A cable to the other fog light. For neatness, I ran the 20A cable through the plastic cable tray which carries the main battery cable.

The next part was creating a connection to each fog light and terminating to the body, this created the ground reference....and thats it!!

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