1979 gmc truck all medium and heavy duty models 1979 gmc diagrams wiring duty truck heavy medium models publisher corporation motors general number item
1975 GMC 4500 thru 9502 Truck Wiring Diagrams
1979 Gmc 5000 Electrical Wiring Diagram
1975 softcover factory 1975 gmc 4500 thru 9502 truck wiring diagrams