electrical problems '92 4dr Blazer

Having problems with the interior light circuit on my '92 blazer. 20amp fuse blows shortly after placing in fuse block. I have a basic shematic that only shows interior lights, dimmer switch and door switches. The horn, side view mirrors, radio, cigarette lighter and rear hatch switch is also on this circuit. I tested what I could with a digital multimeter. The only high impedance I found was when I checked the connections to the rear hatch switch. Can anybody suggest any type of solutions or where I can get a more detailed schematic? I would definitely appreciate any help. Thanx

http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/12/b2/67/0900823d8012b267.jsp <---pick out your model vehicle from that list, hopefully it will be more specific than what you have now. :)

I have a 92 Blazer too, and I'm having random problems with it sucking the battery completely dry, so I have to find the open circuit that must have cropped up. Fun fun.