While driving to my friends house the other day my car began to act strange. The first thing i noticed was the dash was not as bright as it usually is. I remember thinking this but not thinking anything of it. While driving my music suddenly turned off. I was getting static through the speakers when the unit shut off and quickly turned back on and began to play. I then looked at my volts and realized they were almost in the red area. I continued driving with only my parking lights and made it to my friends house. At his house while parking i tried to turn my lights on and my car almost stalled. The next day I started it to find the power back to normal. While driving home the volts slowly decreased. Is this a breaking alternator, is an alternator hard to replace? My experience with cars is limited and am planning to attempt to replace it myself. Thanks for the help everyone.