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.
- Trim Removal Tools
Prepare the GREEN dimmer wire for your gauge and the GREY factory loom wire. This GREY wire will provide the switching current.
Connect the wire tap to the GREY and GREEN wires, then squeeze with pliers to terminate the connection.
As you can see, the metal terminal has wrapped around the factory wire, providing a perfect connection without completely cutting the wire.
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.
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’.