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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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