1994 S10 Blazer Won't Start

I have a 1994 S10 blazer, tahoe, 4.3 vortec engine, with a remote for the electric doors with car alarm, if it has electric start it doesn't work, 2 buttons on the remote. My problem is that it won't start. It started out with the interior lights not going off. Pulled the fuse for the horn and interior lights. About 3 hours later the battery was dead. Charged the battery and pulled the fuse for the electric doors. Battery died again. Alternator is good. Any suggestions. Really need help it's the only vehicle that I have to drive.
Thanks.

Charge up the battery and get a good amp draw volt/ohm meter and start unplugging untill you find the short.
Good Luck.
MT