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HELP! Backup sensor reverse light color?

Elchinophil

Ready to race!
Hey Guys,

I'm stuck. I'm installing a reverse backup sensor. I tapped into the grey/black wire in the C pillar harness under the trunk lining and black for black. I'm not getting any voltage reading when my wife puts the car in reverse.

Does anyone know the backup light wire that i'm suppose to connect too? I've been reading it's grey/black or blue?

It's a 2012 R which should be the same wiring as the MK6 right?

Thanks!!!!!!
 
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