I'v got a 2009 4 cylinder with about 75k miles on it. 6 months ago the Brake and ABS light popped up for 2 days then went away and never came back. Yesterday the battery dash light popped on when I was on my way to work. Today it was on along with the ABS and BRAKE dash lights and as I'm exiting the highway after a 15 miles commute the radio shuts off. 30 seconds later the dash goes dim. I hit the gas when the light turned green and entire dash goes dark and I have very little power to accelerate. Just when it seems the car is going to die out all of the electronics reboot, car runs just fine and I have no more dash lights.

The battery is 2 years old, alternator is original. I know I need to get the voltage read on it and the alternator to really figure it out but in the mean time I'm stuck at work and trying to see if anyone has had this problem before and what fixed it. My hope is it's just the alternator

 

Battery or alt issues (low voltage or current) can cause all your issues.

Check battery cables for connection and corrosion problems.

If having a volt meter. Check battery voltage after sitting for 30 minutes engine off. A 12.6V is fully charged.

Check battery voltage with engine at 2000 RPM. Voltage should be between around 14.1 and 15.1. The higher voltage being the alt charging the battery.

The alt should last a lot longer then 75K! Generally the brushes wear out first but these should be replaceable.

Many auto parts stores will stress test the battery for free.