I just bought my first Silverado, a 2003 with a 5.7L V8. While driving it, I notice the battery guage is starting to peg all the way to the right. This is an intermittent problem, and all the electronics and lights seem to be operating fine, and I haven't blown any fuses. When I tried to start pricing alternators and voltage regulators, the information I'm finding on the internet says that the voltage regultor is part of the alternator on the 2003 model, and they have to be replaced together. Is this true?

Also, i tried the search feature, but was bombarded with almost every electrical thread in the forum, so forgive me if this a topic that has been beaten to death already.