1970 Gmc 1500 wiring diagram Read Also: Jeep cj5 wiring diagram 1970 Wiring diagram for 1970 gmc 2500 truck Wiring diagram for a 1970 gmc truck 1970 Gmc truck wiring diagram 2004 Gmc sierra 1500 wiring diagram 2011 Gmc sierra 1500 wiring diagram