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The generator has a grounded brush on the armature AND the field on your unit is connected to the ARM/GEN/positive brush. So, it will always show continuity to ground. Resistance back through the field terminal should be higher than the ARM terminal tested to the frame, but it’s still going to be low. Lift the grounded brush off the commutator and slip a piece of paper under it before testing for shorts.
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The simple solution would be to put a gm 1 wire alternator on her. What I did with d5 98j 525. Working like a champ.
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