So, as some of you may know I recently bought a 2013 Chevrolet Volt. I'm loving it so far! As of now, I've exclusively used the 120v charger that comes with the car, which is limited to a max of 12A charge rate. In doing research about adding a 240v circuit to my garage, I realized that it (appears) to already be set up for 240, although there are no 240v outlets installed. Here's the setup: The house is OLD, 1905. However, all of the wiring has been redone. The garage is about 5 years old, and has a master disconnect switch mounted where I assume the power comes in from the house. The wires are buried. I have yet to remove the drywall surrounding the disconnect, however the garage is fed by a 2-pole 20A breaker in the main panel. The wires running to the garage are I believe either 10/3 or 12/3, there's a red wire connected to one half of the breaker, black to the other, white to neutral and ground to, well obviously. Question is, before I go tearing out drywall, how might this be wired in the garage, seeing is everything in/on/around it is nothing but 120v. Did they run wire, possibly expecting to add 240 in the future, and just leave the red wire capped in the wall? If this turns out to be the case, is it as simple as adding a 6-20 240v outlet post-disconnect with the appropriate wiring and receptacle? I can handle simple wiring, not shocking myself is easy, I just don't want to budget for a $200 charger if I'm chasing a futile project. Thanks everyone!