electrical short

1989 300e gas. battery drains If I pull #8 fuse, delay entry relay clicks as soon as fuse is re-installed, and drain is gone. I replaced relay, with same result. I can't find a book locally with wiring diagram, and have no owners manual, so I don't even know what the fuse is for, biut if I don't pull the fuse, and re-install, each time I exit the vehicle, the battery croakes, and quickly.
Thanks for any info,
Joey13