Original vintage GM automotive manual titled THE CHARGING CIRCUIT- Battery Regulator Generator Wiring Cranking Motor, Electrical Service Made Easy . United Motors Service 1953 UM-300 , Division Of General Motors Corporation, Detroit, MI. 12 page manual. Pictured is the schematics of The Typical Car Wiring System, Electrical Measurements and Instruments, Regulator Operation, Regulation Inspection, and more.
Approximate size 8 x 11 inches.