I just installed my newly rebuilt continental 6 in my oliver 70. started and ran perfectly at the machine shop. I can't get the starter to turn the engine more than 1/8th rev now that is reinstalled on the frame. At this point I am connecting a new 6v directly to the starter (no ground problems). I even tried a 200 amp quick starter directly the starter. The starter works perfectly when removed from the engine and worked perfectly while installed at the machine shop. Do I need to amp-up the input with a larger source? Does a machine shop have higher power sources? Any help would be appreciated.