Could be either, it has the shell of a later Delco 12v but who could tell even with numbers it could have been rebuilt either way. One brush inside is grounded direct to the end frame. One brush is hooked to the Arm post. Internally that same brush is attached to the field windings. The F terminal is attached to the other end of the field windings. If you insulate the Grounded brush with a piece of plastic (from touching the commutaor bars, there should be infinity between all the terminals and ground. With the brush touching, there should be nearly Zero ohms between the Arm terminal and ground, and maybe 2 to 4 ohms between the F terminal and ground. The attached content should solve the issue! Jim
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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