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IETEK
According to my 77 schematic the 30 amp fuse is located in the fuse block at the "ACCY" terminal. (I believe it uses the 30 amp "PWR/ACCY" fuse) The wire is a 12 gau. BLK/ORG. It runs to the relay, from the relay there is a 12 gau. RED/WHT wire that goes to a splice (S70) where it branches off to each window switch. There is a 12 gau. PNK/BLK wire from the fuse block at the "IGN" terminal that has a 10 amp fuse from the "GAUGES FUSE". This wire is the controling circuit for the relay coil. With the IGN switch on the relay closes and provides power to the window switches through the RED/WHT wires. Hope this helps :cheers: