I have a 92 Chevy Lumina Z34 3.4L The battery keeps draining unless you pull a fuse in the passenger side underhood electrical center. Its the 30 amp fuse in the lower lefthand side of the fuse block. The owners manual says its for the fuse block. The mechanic I took it to didn't know what was causeing the drain. If anyone know what to do please email off_ice84@hotmail.com

What ever that circuit feed is the source, no?

^What he said. Follow your wiring diagram and see what went bad on that circuit.