Davida, In response to your statement: "The A terminal is grounded to the housing"
As Bob M pointed out below THATS NOT EXACTLY SO its indeed very low ohms because those big copper armature windings and carbon brushes have very low resistance, therefore, many meters especially a non precision at low ohms unit, may read near zero ohms. The current actually flows from the ARM post,,,,,,, to the ungrounded brush,,,,,,through the armature,,,,,,,,,,,out the grounded brush,,,,,,,,,to case/frame.
ALSO to read the gennys output voltage you need to put the meter on the ARM post and case/frame NOT on the ARM and FLD posts.
Being Pos or Neg ground has nothing to do with FLD and ARM posts connections, the genny can charge at EITHER polarity. Once polarized to where the iron field poles have a certain North/South MAGNETIC POLARITY, when spun the genny will charge at the correct corresponding ELECTRIC POLARITY Pos ORRRRRR Neg.
So polarize it n spin it and put a meter on the ARM and case/frame and thennnnnnnnnnnnn see what voltage is produced ??? and/or run the Motor test I described below.
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