I have a tractor that if I try to start it, nothing happens.. 12 volts on one
Side of soleniod but nothing on the other.. if I jump it with my truck I get
6 volts and it cranks real slow.. where is all the power going ? If I try
To jump the started right with the truck battery I get nothing.. If I pull the
Starter and jump it, its spins,this is most strange.. anyone got any ideas?

Um , You Lost Me There. Are You Jumping To The Solenoid, Across The Solenoid, Or Directly To The Starter Itself??