Posted by Janicholson on March 13, 2009 at 16:42:16 from (64.83.225.108):
In Reply to: delco generators posted by karl f on March 13, 2009 at 14:53:10:
See Glenster's remark below for length of shaft. If it is off of a Farmall, it is one or the other. If it is off of a JD or other (car/truck) all bets are off. If it is a Ford generator (and many others) it will be a "B" circuit generator. Be very careful with unknown generators. The B generators use a voltage supply to the field from the VR. The "A" style on Farmalls uses a ground to the F terminal. If hooked up, or tested as though it were the other they will smoke like a green stick fire for several minutes. To tell for sure "A" or "B", Pull all wires off of the unit (mark as needed). Lift the brushes off of the commutator and put a piece of cardboard under the brushes. Use an ohm meter from the field terminal to ground. If there is a connection, Near zero Ohms, it is a "B" circuit generator as found on Fords. If no conduction, it is an "A" circuit as found on Farmalls. JimN
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