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My Q7 has a towing package. I nneded to hook up a trailer and at the dealer I purchase the 7-pin connector and they told me I needed to buy an adapter from 7-pin to 4 flat connector. When Ipurchased and connected the adapter and hook up the trailer the lights on the trailer flick and the Q7 tell me that the lights are not connected. I pulled up my F-150 and connected the trailer and everything works well.
What is the problem with the Q7 and trailer hitch?
 

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You need to reverse the polarity of the first and 4 wires in the connector. I have encountered this problem myself.
 
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