All after ready and searching I took a small prybar to the starter and after a few good wiggles and shoves it came free. The washer on the flywheel end of the starter looks like it may have been hung up on something. I was able to touch 12v power to it and the small gear extended. I put back onto the truck and tried to start again, the starter made the same sound again and the engine did not turn over. Just to insure there is nothing wrong elsewhere I marked the flywheel and then moved the truck in gear a few inches, resulting in the flywheel definitely moving. Just back from NAPA they have no way to bench test the starter will try to find a shop in Columbus area. I notice that the large screws covering the brushes were all buggered up and when I tried to unscrew a couple they were stuck fast. Thanks for the tips, I did check the od of the positive cable and it is over 1/2" in diameter, leads me to believe it is well over 2/0.

thanks bugnut