So how do I know if my tractor has a class A or B charging system?
If it's a Class B, inside the genny one end of the Field (two sides in series) is grounded and other end goes out to the FLD Post
If its a Class A two brush one end of Field is wired to or same as the ARM post and the other end (of two sides in series) goes out to the FLD post
If its a Class B you apply regulated voltage to the FLD post to control rate of charge
If its a Class A you apply a regulated (straight or resistive and controlled/regulated by VR) GROUND to the FLD post to control rate of charge
If it charges fine if you dead ground the field (full fielding) but not otherwise its likely a Class A. If it charges fine if you apply voltage to the FLD (full fielding) its likely a Class B.
TROUBLE IS when I was a used tractor dealer I saw so many tractors charging systems CHANGED MODIFIED OR JURY RIGGED so just because a tractor was original Class A (such as some Fords) doesnt prove it still is so reading the above may show what yours is HOWEVER if it charges good with FLD dead grounded that tells me ITS A CLASS A.
Again a dead ground on FLD making her charge good sounds like an A while applying voltage to FLD making her charge sounds like a B
Does this answer your question ?? any more questions??
If its a Class A try my Troubleshooting Procedure to help find the problem. Make sure BOTH the VR and Genny have good grounds, try a grounding jumper.......My Motor test (Para 5) and full fielding test (dead ground FLD post) can tell if the genny itself is okay and therefore the VR or its bad ground may be the problem
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