You need a good ground to the frame from battery and a good ground to engine from battery.(may be engine to frame) Also the starter bolts must be tight to obtain a good ground.

"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.