Ok so I get out of work and start my car and I notice that the battery light was on. I drove for about an hour and went home. The next morning I got the car started, took the car to the shop and tested the voltage. The voltage only read 11, so I know that the battery is not the correct voltage. so I got back in the car and drove home. While I was around the corner from my house i was pushing on the brake and the Anti-Lock brake light came on. I rolled up my window (power windows) and it did it again. I am pretty sure it is my alternator but 5% doubt. I can go out to my car right now and my interior lights and head light work but only for like 5 min. Also, if I replace my alterator do I need to replace my voltage regulator?