Im not sure whether you brought your tractor home as "running" or "let's bring it home and find out". So here is my take:
The starter should spin if jumped from battery to the armature terminal only... no need to involve the other (Field) terminal unless you are trying to polarize the starter generator.
That being said and before I or we get crazy... if you jump the starter (battery to armature terminal), you should at least get a spark if you are touching the armature terminal with cable AND does the starter try making effort to spin? Is the motor free enough to spin as if it is not siezed? Maybe take the v belt off the pulley and see if starter spins?
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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