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f1, f2, A generally means seperated field motor with an internal connection or case ground. Your esc is series dc which isn't powering the fields. Resistance measure the A post to ground to see if it is connected, note the resistance. Measure the resistance between f1, f2 [ normally called field windings] and then each one to ground ( youre there and it's a quick check to see if wiring is shorted or if the f1,f2 posts are for reversing) If the fields are the more or less the same resistance as the armature you can externally connect a field post to armature and have a series motor after connecting the ESC M to the remaining posts. If it spins backward, swap the F Post connected to the A post to the other F Post
 
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