Originally Posted by mattedm
I have a 2014 Q7 with factory installed hitch and a Tekonsha Primus IQ Brake Controller that the dealer installed. The brake and lighting signals all work, however the 12V pin does not have any power to it. This means that the trailer batteries do not get charged while I'm towing. I've looked through the threads, but it seams most people are towing boats with the Q7. Is there anyone with a Q7 towing a trailer that can tell me whether their setup charges the trailer batteries when towing?
Have you asked the dealership if in fact the 12V pin is supposed to supply power all the time @mattedm?
They should have the wiring diagram and seeing as its a factory setup they should have the answer.