Headlight wiring

Headlight wiring for Mondeo Mk4

Colour codes for the Mk4 Mondeo headlight wiring, shamelessly "obtained" from a post 4titx made on one of the affiliated forums.

Left headlamp unit

• LH Ignition Live: Violet/White
• LH Sidelight: Yellow/Blue
• LH Dip beam: Brown/Blue
• Negative: Black/Yellow

Right headlamp unit

• RH ignition Live: Violet/White
• RH Sidelight: Brown/Yellow
• RH Dip beam: Blue/Green
• Negative: Black/Violet

What use is this to me?

There can be many reasons, but one good example is a popular mod for the Mk4.0, which is to fit aftermarket daytime running light (DRL) units. If the kit contains one ballast that drives both units, a good location to fit it would be underneath the left headlight.

That way, you don't have to tap into the ground wire of the lamp itself. Just crimp on a ring connector and screw it to the chassis using one of the existing six or so nuts below the air filter box.

Then, wire up the main +12V to the violet/white wire, and the switched input to the yellow/blue wire, using one of the methods below:

• T-tap (quick and dirty)
• Solder and shrink tubing (reliable and beautiful, if done right)
• Home made tap loom using bullet/blade connectors and spare wires