John - Not sure if it will help, but here's a link to an original 1946 Truck Wiring Diagram found at the oldcarmanualproject.com.
It is for the original 6 volt with generator setup, but should be a good basis for your install, with changes for the alternator when you get to that point.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
