[rames14]

Mike, it goes to the battery. It is a controlled draw from the truck, so you cannot damage either side from the 7 pin. Many people think that you are charging your battery this way, but you probably aren’t coming close. As several above said, it is only providing 5-7 amps/hr. My Montana draws 10 amps/hr just sitting. If you have a residential fridge, you are drawing more. We have been towing Montana’s for almost twenty years. The 7 pin will not cause an issue. As for DC-DC charging, there are several methods. The most popular are the Renogy and BIM. We have the BIM system on ours. If doing it yourself, be sure to follow wiring size and disconnect guidelines. Failure to install properly can do a lot of damage. Ours has 80 amp disconnects at the RV and truck, 2/0 wire and the BIM. An Anderson connector in the bed of the truck provides the disconnect point when unhitching.