Car dead after alternator and battery replacement
 

2011 Nissan Maxima S had alternator replaced. Car ran for about 20 mins, lights flickered on dash and lost power. Waited for about 40 minutes car cranked and ran for about 3 minutes before dying. Got a boost off car cranked up immediately. Drove to auto zone tested battery which was at 65%. Purchased new battery. Car dead, no lights will not take a boost. I was informed there maybe a loose wire somewhere?? Terminals are corroded(doesn’t seem to be) or fuses blown?? What fuse? Need help. As of today nothing comes on and won’t take a boost.

Was the alternator replaced by a shop? It sounds like for the 20 minutes after the alternator was installed, the car was running purely off the battery and the alternator isn't chargning. If a shop replaced the alternator it should be warranty and they should figure it out, would be worth calling them

Check the Alt Fuse in the IPDM often times this blows as a result of the OEM failing, the fuse needs to be checked and replaced.