If the starter is still on the motor you might try this. Take a working voltmeter, set it for plus DC @ anything over 12 volts. 25 volt full scale is about right. Hook the red lead to the "s" terminal, black to ground. Have someone bump the starter with the key. The voltmeter needle will "jump". If it does not jump to 12 volts then return to zero when the key is returned to off you got it wired wrong. If it does return to zero the problem is in your starter system or how is the bolted up to the fly wheel. Note: a bench test is a good test but remember that in a no load application such as a bench test, very little current is going through the starter. In the real world 50 plus amps are being used depending on how much energy is rerquired to turn the motor over. You may have a high resistance short. Take the stater to a auto parts place and they can test it under load if you suspect this might be your problem.
