I have a 2009 Chevrolet Aveo that I bought new from the dealer.
Today I was running errands around town and just as I was about the get on the highway to head home, the battery light and emergency brake light turned on. As I was driving home, the electrical components in the car started going out one-by-one. First the tachometer went to zero, then the fuel and temperature gauges, then the windshield wipers started moving slowly, the radio turned off, then all off the lights on the dash. Each one of these shut off 30-60 seconds after the one before it. As I was pulling off the highway and onto my street (which is a hill) the engine started losing power. I was able to crawl at a snail's pace about halfway to my house (50 meters) before the engine died. I put it in reverse and compression started it, put the emergency brake on and shifted to neutral. After I shifted it to neutral, some of the components in the car started turning back on and off and the RPM increased. After letting it sit for a few minutes I was able to crawl the rest of the way home (another 50 meters).
After getting home I took my girlfriend's car back to town and got a multimeter. When I got home about 2 hours later I tested the battery with the engine off. It read 12.18 volts DC. To my surprise, when I turned the ignition the car started right up with no battery light and all the electrical components working. After about 20 seconds the electrical components started turning off. I was able to test the battery with the engine running and it jumped between 3-6 vdc for a few seconds before the car sputtered and shut off.
I am thinking alternator or connection problem, but I really don't have much experience with this kind of thing. Any ideas?