People spend a life time trying to make good recordings. If your willing to spend time learning how to record properly, use a decent program, and spend a little money not a whole lot but def some. You will got a lot better result.
FL studio
Apple Logic
Reason with Record (The newest version of reason might have it included)
ProTools 10 just came out but I'm sure you can find a pretty good deal on version 6, 7, 8, or 9
Personally i always think its a good idea when your adding on to a cars electrical system to upgrade the alt the original design of the stock alternator was never intended on supporting additional electrical drains.