Something is draining the battery. I put a test light between the negative cable and the negative post and have power, I tried pulling each fuse individually and each relay and circuit breaker and never lost power.
The alternator and the starter are on a fuse link circuit that pulls power from the battery before the fuse panel. Try to disconnect the power from the alternator to see if the light goes out, if not then disconnect the starter solenoid power.
Did you disconnect any circuit breakers to see if the light went out?
Try these suggestions and let me know how you make out.
This may sound stupid, but did you have the hood lamp out of the socket or disabled? Also was any of the doors open when you were testing? I pulled a lot of hair out by missing the little simple things.