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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.
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Hi there,
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.
 

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brown is ground on all vw/audi that´s just fact sorry to say.
on a harley ground is black.
since iam 42 and have been retrofitting and playing with vw/audi since i was 18 well i do know a think or 2;)

regards
sören
 

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