Hi, I have a 2013 Up!. On the underside of the cigarette lighter, there are 2 wires coming off it, one is brown, the other is red/yellow or red/orange striped (its hard to tell). Does anyone know what each wire does? I'm trying to add a USB port.
The red/yellow wire connects to fuse #36 under the dash (positive), while the brown one connects to ground (negative). I can't promise brown is always negative, but that certainly seemed to be the case while searching the wiring diagramme for the 12V socket details.