[rockfla]

after you check and have the bracket that holds the starter in line and positively in place make sure you have the correct size (Diameter) cables for both cables, a 6V system uses much larger battery cables than a 12V system. A quick way to make sure your cables are big enough is when cranking your car reach down and feel the positive side cable, if its hot by the time the car cranks, its too small of a cable. And the longer the positive cable, the bigger it needs to be. "Ought- O " diameter cable is the recommended starting size at least ,"00" is even better. Second would be the condenser, even though its a NOS one it could be failing when it gets hot....there have been "Several" post here on the barn on how to check your condenser and should be able to search that relatively quick and easy.