Sorry for the confusion... Yes, I meant that the lighter outlet is giving off around 12.9 VOLTS. I get this by placing a meter in the lighter outlet. My RV is an 84 and the lighter outlet is in the same place it always was. While the wires are not as thick as the AC wires, they are pretty darn thick. And again, I am getting almost 13V through it.
I do plan on ONLY running something small from it (like a small laptop) or charging a phone. I guess I will try running a new wire from the battery (but I assume this means I have to have the battery in for it to run, and it will not run off the converter as it does now).
Running a new wire will be a heck of an undertaking though... I think I will have to rip up the floor to do it.
It is odd that it works fine in my car... You would think it would be the same thing with the wires. Even LESS in a car.
EDIT>.. I checked the wiring and it is 12 guage.