81 Riv Electrical Short problem

I have a 1981 Riviera that has a problem with the battery draining while it's off. Me and my friend checked all the fuses and have not found a short in those. Is there anything electrical in the car where it is not attached to a fuse? Or if anyone has any ideas of how to find the short? Thanks..

Get a milliameter in series with the bat cables and see what the drain is, not a short, so no blown fuses are involved, pull one fuse at a time till the draw drops to about 25-50 ma.