1975 Lincoln Continental Issues

I have a 1975 Lincoln Continental that is having some issues. Something is majorly draining the battery and I dont know what. It has a new alternator, cellonoid, and battery yet within a day or two the battery will be flat.

I replaced the cellonoid behind the battery today and put in a freshly charged battery and she fired right up. However within 10-15 minutes , the oil warning light came on and she died. I cranked it and cranked it and she finally started again, however I am sure if I go back out tomorrow she'll be dead again.

https://d.facdn.net/art/duallyhips/1511122068/1511121956.duallyhips_image.jpg

Well no easy answer here as you can guess. Check for current flowing when everthing is shut down. Use a test lite or ammeter. Then start pulling one fuse st a time or relay to try snd isolate the source, this includes the alternator. Lots of electronics on that car