A starter draw test will tell you how much current the starter is pulling. But more than likely you have the famed" hot soak selenoid "problem. First make sure your battery terminals are in good shape and at least a #4 guage. Especially the ground, make sure you have a good contact with the ground ,at the engine. You could wrap the starter with a therminal insulation barrier like they use in the floor boards and secure it with a large screw clamp. or make a heat shield to deflect the heat from the starter. your last choice is a hi-torque starter, or a remote selenoid kit for your starter like the one ford uses.
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