Baffling Buick

Hello fellow AF members - I'm new to this forum - I found this site while trying to find answers to a problem with a coworkers 1995 Buick Roadmaster - I hope someone can give me some advice - The car runs o.k. but at times all the warning lights come on "ABS - air bag - service engine soon" when this happens the car has no power - I hooked my scanner to it and pulled about 16 different codes from the computer ;"11,12,13,14,15,16,18,19,21,22,23,24,25,26,27,29" and 6 history codes;"38,51,70,71,77,78"
I believe that there is some sort of electical problem but I'm not sure which direction to go due to my lack of expierence with GM products - Thank you for any help you can give me

Welcome to the forums, fordnut66. For having that many codes, I'd consider having the ECM tested. Have you cleared these codes just to have them come back again?

I have spoken to my coworker today. He had taken the car to a shop last weekend because the car quit on the road and would not restart. Turns out the alternator would go bad when hot. All the times that I was able to test it, the car was cold. Thank you for your help.