Review on 💡 Metra XSVI-9003-NAV Accessory Power Retaining Harness for Non-Amplified and Non-OnStar Systems by Jacob Mayberry

It turns out that the Volkswagen generation MK6 does not have a switched 12V connector on the wiring harness. This means that using a standard wiring harness without a CAN bus adapter will likely drain the battery for most aftermarket head units. I learned this the hard way after what seemed like a successful install, but it later resulted in a dead battery after leaving the car idling for a week. This product solved my battery drain issues and still allows the device to stay on after the car is turned off (keeps power from the accessory). If you don't solder the wires together, you will likely also need butt connectors to connect this harness to the harness that came with your head unit. Pay attention to the wire colors as some of them are very similar (e.g. green/black and green/purple).