Audio Systems: Rear Speakers & Amplifier 94 Suburban, delco radio, rear speakers

Question
Just purchased '94 Suburban, Front Speakers working, Rears are not, Fuse on Amp under Passenger Seat blows instanly. Looks like non factory wiring 12 Gauge has been used to connect to Plus Channel 1 and Negative Channel 2 on this amp. This may be reason amp blows fuses. Amp under Driver's Seat appears to have multiple speakers wires connected possibly in an attempt to get rear speakers working. IS there any sort of diagram available that describes how this thing is really supposed to be set up and working. I'll assume Channel 1 marking on Amp refers to Left Channel and Channel 2 refers to Right Channel.

Rear Speakers - Are grilles held on by Spring Clips that just pull off or is there some sort of hidden latches / trick to remove to check wiring back there.

Answer
i am sorry i don't have any diagram for this
the way it works was  
the delco radio will drive the two front speakers from the radio and the 2 rear door speakers from the rear channels of the radio
there was a factory amplifier under the driver seat the input signal comes from the rear doors and the output signal is send yo the rear speaker on the roof or last doors on the back


when the amplifier is defective only the last speakers fail not the doors if the problem is in the rear doors check the radio  and the amplifier needs to be original  it was a delco amplifier
sorry i can not help you more