Battery light come on

Hello, a belt can cause a battery light to come on if it is slipping on the alternator pulley, causing the alternator to not spin fast enough to put out enough amperage to recharge the battery. 11 volts is definitely not enough, but what about amperage output when the engine is running at 2,000 RPM? A "new alternator" doesn't mean it's working. You can't assume that. Some come out of the box faulty. Lastly, you'll want to check the alternator wiring connector and harness to make sure there is no damage or issue in that area. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops