All sorts of good info! Looks like I have an excuse to get out my multimeter this weekend.
I'm not really PLANNING on charging the battery in my TT from the car, I just want to know HOW to do it if really needed, and how NOT to do it by accident. I don't want a dead TV battery either.
To someone that asked, I did not wire in the 7-pin by hand. I bought a kit from Nissan that had it all wired for me, and I just plugged it in. Also, it did come with the towing package (upgraded cooling, hitch, etc), but that package only came with a 4-pin. The 7-pin was a dealer installed option, which is essentially what I added on, along with the relay to fire the brakes.
Eric, Tara, and most of China
2013 Camping Nights: 2
2014 Camping nights: 31
TT 2014 Rockwood Roo 183
TV 2012 Nissan Armada