Hi, 2011 Chevy Equinox Check charging system and battery light came on, replaced battery, that didn't work, replaced alternator that didn't work either. Any ideas? I did get codes P0621 and P0622 no check engine light on. Thank you!

 

Both codes indicate a problem with the control circuits for the altenator. Is the alternator providing 13.8 volts to the battery? Did you re-connect the control connector on the altenator?

 

Replaced battery and alternator myself, didn't fix it, had it towed to mechanic, turns out it was a wire from the starter to battery. $1200 later in total, had the starter replaced as well. So far so good.