Introduction

In this guide we’ll show you how to connect the dimmer wire on a MK7 Golf. For this demonstration we have P3 Cars OBD Vent Gauge that needs to be wired up accordingly.

Tools Required

  • Trim Removal Tools

Step 1

Using a trim removal tool, pop off the side trim to reveal the wiring.

MK7 Golf Dimmer Wire

Step 2

Remove the switch assembly. To do so, push the dial inwards and turn to the right.

MK7 Golf Dimmer Wire

Step 3

You can now pull the switch assembly out from the dashboard.

MK7 Golf Dimmer Wire

Step 4

Press down on the red tab to release the connector and place the switch assembly to the side.

MK7 Golf Dimmer Wire

Step 5

Prepare the GREEN dimmer wire for your gauge and the GREY factory loom wire. This GREY wire will provide the switching current.

MK7 Golf Dimmer Wire

Step 6

We will be using a 22-18 AWG wire tap to intercept the GREY light switch wire.

MK7 Golf Dimmer Wire

Step 7

Connect the wire tap to the GREY and GREEN wires, then squeeze with pliers to terminate the connection.

MK7 Golf Dimmer Wire

Step 8

As you can see, the metal terminal has wrapped around the factory wire, providing a perfect connection without completely cutting the wire.

MK7 Golf Dimmer Wire

Step 9

Close the wire tap cover and use electrical tape to neaten the installation.

MK7 Golf Dimmer Wire

Step 10

Pull the loom back into the dashboard and reconnect to the switch assembly.

Reinstall the switch assembly by pushing it back into the dashboard and rotating the dial to the ‘OFF’ position.

MK7 Golf Dimmer Wire Installation

Step 11

Reinstall the side trim cover.

MK7 Golf Dimmer Wire Installation

Step 12

Test functionality by switching the headlights on and off. Your gauge should dim when the headlights are turned on.

For those using a P3 Gauge, be sure to enter the settings menu and change the display options to ‘On.A’.

3 comments on “Dimmer Wire Installation

  1. Justin says:

    I have a mk7 GTI, is there a way to hook up the green wire to the actual dimmer switch to control the brightness in conjunction with instrument panel lights?

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