G503 WWII Willys and Ford Mid/Late 1944 Jeep Wiring Diagram G503 WWII 1944 Willys MB and Ford GPW Jeep Early Wiring Diagram. In 1944 there where two wiring diagrams based on the type of main switch that came with the manufactured jeep. The top diagram is the push pull main switch, and the bottom wiring diagram is the late rotary switch wiring diagram. If you have the Rotary Main Switch G503 WWII 1943 Willys MB Jeep Re-Wire or Wiring up your Jeep G503 WWII 1943 Willys MB Jeep Re-Wire or Wiring up your Jeep . This article shows the wiring or re-wiring steps for you early to mid WWII Willys jeep with a new wiring harness. 1. Over the years as the wiring on a jeep deteriates it is replaced with wiring that is not correct. G503 WWII 1945 Willys MB and Ford GPW Jeep Late Wiring Diagram G503 WWII 1945 Willys MB and Ford GPW Jeep Late Wiring Diagram. In 1945 Willys and Ford were using the main rotary switch wiring diagram. Wiring Schematics | eWillys 1972 CJ-5 Wiring Diagram. 1978 CJ-5 Wiring Diagram. 11 Comments so far • Add to favorites. Post navigation. 11 Comments on “ Wiring Schematics ” ken hennessey December 25, 2014 at 7:11 pm. Wireing diagram for a 1956 willys wagon? ken hennessey December 25, 2014 at 7:15 pm. 1956 willys wagon wire diagram?