I called numerous mechanics in the area I have used over the years and gave them the symptoms. All of them said, "starter" and all suggested moving up to the higher and lighter H.P. unit. Price ranges were comparable for the Bosch rebuilt units.
I have cleaned the cable connections, installed a new wire post fitting after cutting off an inch of old stuff on the cable to the battery end. With the "Hot Start Kit", the concentration of spark to the solenois is like a jack hammer compared to what it was like before I installed the kit. Its a bang more then a click! That tells me at least that the kit does work as far as concentrating more energy to the solenoid. I have yet to beat the crap out of the starter with a hammer yet, but getting close!
My son's starter went this way as well despite all the tests and some preplacements. When the solenoid is shot, it gives up the ghost in a strange way. Its good to know though it lasted 30 years heh? I show no record from the previous owner of a starter replacement,
Appreciate the feedback fellas.
Regards
Bob
73.5T