My wife drives a 2001 Buick Century with ~130k miles. A few days ago, she was driving it home when she described that several warning indicators came on suddenly, the windshield wipers stopped functioning, and she began to hear a winding noise. The car continued to drive home and when I opened the hood to look at it, I could smell a burning smell like an electrical fire. The car now does not hold an electrical charge for more than a few hours, but if I jump start it, it will run normally for at least a short period of time. I also checked the OBD2 fault codes and it reported P1404.
At the time, we were just about to buy a new car so we went ahead and bought one. This car now sits in the driveway as I try to sell it. I estimate it's not worth much more than $900, so I'm looking for suggestions on how to diagnose this car myself with minimal investment to see if there is a potential DIY fix that would make it more attractive to potential buyers.