96 K1500 battery light on

I went out to my 96 gmc k1500 this morning after auto-starting about 10 minutes before to let a/c cool the cab. It was running fine but when I got in I noticed the battery light was on and the electrical gauge was topped out past 19 into the orange. I turned the key into the "on" position and when I hit the brake pedal to put it into gear the engine started surging and then dieing down, back and forth (approx. between 500 and 1500 rpm) until it just finally died (lasted about 20-40 sec.). Ignition was still in "on" position but the electrical gauge returned to normal. Tried starting it again and electrical gauge jumped right back up and battery light was still on but the engine didn't start surging again until I hit the brake pedal just like before. I'm going to guess my alternator/voltage regulator needs to be replaced but beyond that I have no idea what else it could be. I'm not a mechanic by any means but I've managed to make minor repairs over the years myself with the help of Chiltons or Haynes manuals. I have a Hanyes manual for this vehicle but the troubleshooting section doesn't cover my problem specifically.

Before I would drive it, you'll need a voltmeter for battery and alternator testing. Youtube has tons of videos on "how to". If it is actually over charging, you could damage some electrical components.

Pulled alternator and took it to Napa to have them bench test it. Wasn't grounding so I bought a re-man and put that in. Seems to have solved the problem.

Thanks for posting back. Glad you got it running.