Posted by Janicholson on August 27, 2010 at 10:19:12 from (199.17.6.223):
In Reply to: Generator/field posted by Baley on August 27, 2010 at 08:36:54:
"A" or "B" system ??? An A based charging system uses internal connection to a brush (or a third brush to energize the field. A "B" style uses an internal ground, and an external voltage to the f terminal for energizing. Some early fords are A type, later are B type. If the gen wires are disconnected, and if the brushes are held up off of the commutator with a slip of plastic, an A generator will conduct from the Arm terminal to the F terminal (less than 5 ohms). If it is a three brush, it will conduct from the third brush to the F terminal.
If it is a B system the F terminal will show less than 5 ohms to case ground, and the Arm terminal will show open (with the brushed off of the commutator. Jim
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