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Old 06-02-2014, 03:08 PM   #1
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Default Q7 Trailer 12V on 7-way plug

Hi,

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?
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Old 06-03-2014, 03:04 AM   #2
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Quote:
Originally Posted by mattedm View Post
Hi,

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.
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Old 06-03-2014, 06:05 AM   #3
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I believe there is a separate wiring assemble with a control module to facilitate trailer power.

Here in the UK I have fitted the 13 pin power connector rather than the basic 7 pin and I guess that provide for additional auxiliary power but I don't use it for anything other than a small trailer for bikes etc...
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Old 06-03-2014, 11:56 AM   #4
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I just got off the phone with the dealer, he wasn't confident but asked around and it seems that the Q7 does not provide 12V to the 12V pin on the 7-way adapter. It looks like I'll be splicing into the the auxillery DC power in the trunk to get 12V to the pin.

However, it looks like there is power to the auxillery DC ports at all time. Seems I will have to unplug if I don't want to drain my battery.
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Old 06-03-2014, 05:25 PM   #5
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Are you referring to the 12v outlet in the rear area?
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Old 06-03-2014, 09:29 PM   #6
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Yah, the outlets are always on in the Q7. I'm thinking I may be able to get at the 12V going to the brake controller. There is a blue and black pair plug between the Audi towing module and the spare tire. I'll put a meter on it tomorrow.
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Old 06-04-2014, 12:08 AM   #7
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I am sure that over here in Europe there is an additional wiring kit for managed power to a trailer.

I'll have a loo to see if I can find any details.
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Q7 4.2Tdi S-Line 2008 - another V8 diesel!
A8 4.2Tdi, 06, Grey/Grey - my new toy - how can a diesel be this fast? SOLD 21/06/2013
2010 A4 2.0tdi 6 spd SE Executive avant - dark blue & Vanilla - Wife's new one.
VW Touareg 06 30k 6spd 2.5Tdi - Wifey's new one, A4 was not big enough!
A6 2.7t 01my 6spd Avant 51k miles - Sold Dec 2011 - Gone to Banbury
A4 2.0FSi SE 03.8 22k miles - Wifey's new one - the golf was not luxurious enough. Sold 30/08/08 - gone to Heathrow.
Golf Tdi 03.08 130pd, 6spd, 19k miles - Sold 8th November 2006 - gone to Coventry!
A6 2.8q 98.11 115K miles - sold 20th Feb 2006 - gone to Kidderminster.
100 2.8q 92.1 147k miles - Sold 6th July 2004 - its new home is Edinburgh
A4 1.6 97.8 99k miles - Sold 12th Feb 03
VW Golf Gti 86 22k miles 2.0 Oettinger 190bhp, lowered, lightened and quick and sold 23/03/08. Gone to Coventry.
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Old 06-04-2014, 12:45 AM   #8
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When i bought my Q7 at Xmas, i had the extra wiring fitted for 12v charger and fridge, when towing the Caravan.. Some dealers in the UK will charge for this, costs can be around 400...
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Old 06-04-2014, 12:45 AM
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