Reply to "AF 312 armature shorts only in reverse."

To check the armature, take a meter reading off two plates at a time. Each pair should have the same approx. ohm value and none should read continuity to the shaft. Make sure commutator's gaps are clean (brush them, etc) 

I'd suspect brush tubes or wiring though.

"Still trying to not shoot my eye out"

 

"Nursing insomnia one railcar at a time"

My aroma therapy? Smoke Pellets.

 







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