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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Can you tell me what year this model is so I can check some diagram info?
Let me know, thanks, Pete.
O.k., since we are in different countries I am not showing the A3 in this model year.However, I did find some info on this.
It looks like you should have two to four back up lamp options here.
The power feed wires at the lamps are:
These four wires ( one at each reverse light bulb ) are the power feed wires.If this is not what you are looking for let me know.
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Test to see if the black/blue has power on it when you shift to reverse only.If it does then I would use this wire.If it does not let me know.
Let me know if you need anything else and feel free to rate my help here or above ( should be a link to click on ) as this is how I receive credit for my time,this can be done at any time and you can still come back here and reply if needed.Your 5 star rating is appreciated