Need help with battery light
A few months ago my battery light turned on, on the car's dashboard and my voltage slowly started dropping from 14v to as low as 10v upon starting & it would fluctuate. I've had the battery, alternator, & starter tested 3 times from 3 different places and one mechanic suspected it was the alternator.
Well instead of shelling out that $500 right away I took a closer look myself and cleaned the corrosion off of my battery posts, and after that the voltage went back up and the battery light turned off.
The car was fine from May up until now and the battery light is back on. I've also noticed the ground terminal is very rusted but I've had the battery & alternator re-tested at O'Reilly's and everything came back as good once again.
Does this sound like a connection issue? Should I just get new battery terminals or does this sound like an alternator issue to any of you? I'm scratching my head with what to do.