That depends on whether the truck came with a 6 or an 8. Sixes were 6V positive ground, eights were 12V negative. In 1956 they all were 12V.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.