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Should I have power from the green wire with the key on and the engine not running?

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You'd have switched 12V to the blue wire terminal at the alt field then it'd go in/thru/out the internal field to the outside green wire field terminal so yes. take off both field wire female connectors & see if there's continuity between the 1 green wire male terminal on the brush assy to ground (should not be) & check the brush & it's holder for continuity to ground somewhere (should be no continuity). Something is grounding & making the field circuit full field on the green wire grounding side just like it would if you deliberately full fielded the green wire. Holler how it goes Stump!

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I should say, the green wire gets negative pole AT BRUSH END disconected, but checking from regulator plug disconected, green wire will test for positive pole, due the power coming in from to the blue wire alt brush and coming out from the other bush once goes by the rotor