There we go! Now it's working.
Rewriting this because I don't want to double post.
So before my brother passed his '04 Yukon down to me, he attempted to install halogen lights into the car. Now, here's where things get interesting: when he installed the lights, instead of installing them straight into the car like regular bulbs, he put in an amplifier that made the lights run at such a low power that the lights appeared at a dark purple/blue. Now, while this may have been OK with my brother, it made driving at night nearly impossible (I have had so many close calls by now I am convinced that miracles do indeed happen.)
Finally I was done. I bought some new lights, took the amps out, and viola! These things are REALLY BRIGHT now!

They aim a little bit low as of this edit, I'm going to adjust them tomorrow.