You POLARIZE A or B by passing current through the field windings which imparts a degree of the correct North South Magnetic Field Polarity in the soft iron poles around which the field windings are located...
Since in a Class A the fields begin at the ARM post (2 brush gennys) you jump hot battery voltage there which causes field current flow TO MAGNETICALLY POLARIZE THE GENNYS SOFT IRON FIELD POLES.......
Since in a Class B the Fields are internally grounded, if you apply hot battery voltage to the gennys FLD post you get field current flow TO MAGNETICALLY POLARIZE THE GENNYS SOFT IRON FIELD POLES.......
I prefer and advise polarization as Delco and Deere manuals state BUT REALIZE OTHER METHODS (as based on VR's internal wiring and system) can accomplish polarization. On A's I jump from BAT to ARM, while on B's I jump hot battery voltage (such as present on BAT terminal) to FLD.
DO AS YALL LIKE AND WHAT WORKS FOR YOU, I prefer what Delco and Deere manuals state but thats just me. AGAIN other methods can (based on VR internals and wiring) still polarize. Your tractor YOUR choice
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