Good morning Brandon, long time no see since I gave my Electrical Seminars at Two Cylinder Expo in New York. I will address your good questions and comments one at a time:.. ..
1) I've always followed the JohnT instructions for polarizing generators. Flashing BAT power to ARM post... .
I STAND BY THAT INSTRUCTION when it comes to my Deere posts and many other tractor brands that use CLASS A CHARGING SYSTEMS. NOTE I often added that if the ARM terminal on a VR is hard to get to just jump BAT on the VR direct to the gennys ARM post, does same thing... ..
2) I posted this somewhere and started a mini argument, from a guy who always flashed BAT to FIELD.
THAT IS WHAT I ADVISE FOR CLASS B CHARGING SYSTEMS
3) Others have been on one side or the other.
TRUE because A or B are different
4) I did more digging, and apparently it depends if you have an A circuit or B circuit generator on how it's flashed... ..
YOURE EXACTLY CORRECT
5) But I'm wondering if it's even a hard and fast rule....because we both made either choice work on JD generators? I can't remember if JD used A or B type circuits... .
ALL THE TWO CYLINDER DEERES USED CLASS A AS FAR AS I KNOW.. .
6) Depends on the circuit in your generator. According to the Delco-Remy service bulletin dated 7-3-61, there are two different circuit types of generators:..
Type A circuit - The field winding is connected to the insulated brush inside the generator and is connected to ground through the contact points in the regulator.
Type B circuit - The field winding is grounded inside the generator and is conncted to the armature circut inside the regulator.
I dont have diagrams of all VR's BUT THOUGHT THE GENNYS FLD POST CONNECTED TO FLD TERMINAL ON THE VR ON CLASS B SYSTEMS ???????????????????????????????????????
7) To polarize the generator with: Type A circuit - Momentarily connect a jumper lead between the regulator BATTERY and ARMATURE terminals after all leads have been connected, but before the engine is started. .. SAME THING IVE ALWAYS SAID....
8) Type B circuit - Disconnect the lead from the regulator FIELD terminal, and momentarily touch the lead to the regulator BATTERY terminal. This should be done after all other leads have been connected and before the engine is started...
I AGREE
NOTICE AND FYI of how Polarization works for anyone who may not understand:::::
When you pass current through the gennys field windings in a certain direction, you impart a degree of magnetism in the soft iron field poles AND THE DIRECTION OF CURRENT DETERMINES THE NORTH SOUTH MAGNETIC FIELD POLARITY. Thats what polarization is all about
FINAL some jump BAT to ARM on EITHER A or B systems which can work HOWEVER I advise and prefer the same as recommended above
BOTTOM LINE do as you please its YOUR tractor YOUR risk,,, but I stand by what I always posted and the manuals above ON A SYSTEMS JUMP BAT TO ARM........ON B SYSTEMS JUMP BAT TO GENNYS FIELD POST even if other methods may still work.
REGARDLESS passing current through the field windings in one direction or the other is what sets the North South magnetic field polarity
Hope this helps Brandon if I missed anything maybe he other fine electrical minded gents can add to or correct this ??????? AGAIN even if other methods might work I STAND BY THE MANUAL and its whats ALWAYS worked for me
John T Live in the RV from the Elnora Indiana tractor show
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