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check polarity of fields ---one has to be "north"--you can do it from outside, only put compass close when power is on (field energized) or you can change compass
with armature on growler measure amp output of armature commutator bar to bar, always same place, but rotate armature to next bar---most generator will make around 15 amps(ac amps on growler)----even a jumper wire and compare sparks
does the commutator coloring look the same all around ---or do one or 2 bars look different