Ok guys. 1980 El Camino swapped in 350. Can't get motor to crank. Bench tested starter it's good. Checked signal wire when key cranked 9.83V. New battery cable to starter also 12.43V. When signal wire not hooked up to S side of starter 12.43V. Bendix engages but isn't turning. I don't know if I'm missing something or if there's something wrong with the starter. Any ideas?