Technical: Generators
Dave Hennessey, with help from Perry Ruiter
--- REQUEST FOR COMMENTS ---
Model 52K Generator
The Model 52K generator was used on the 1952-1956 K and KH, and the 1957 Sportster. From 1952 to ~1955, the ID was on a tag. Then from ~1956 to 1957, the ID was a stamping. These dates are approximate.
1952-1955
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1956-1957
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WARNING: The K-models used a 52K generator. Harley also made a Model 52 generator, which was used on Panheads, but not on the K-models.
I have seen this regulator mounting setup a couple of times, and I do not know if it is stock. The 1954 Spare Parts Catalog shows a 1/2" long bolt and plain nut.
Front View
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Top View
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Inside View
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Wiring Diagram
H.D. - Sketch 305-M
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Notes From Perry Ruiter
The 52K has a terminal just to the left of the positive brush which connects to the F terminal. Two wires attach there, not directly to the F terminal.
The two wires on each field coil are not equivalent. It absolutely matters which wire goes where. You're creating two electromagnets around the pole shoes and you want one to be a north pole and one to be a south. Hook the wires up wrong and you get two norths or two souths and the generator is frozen in place, and won't rotate. Get the wrong pole shoe north and south and it rotates the wrong direction. So you need everything just right for it to work. Now that being said I've had factory field coils were the leads were backwards and I needed to swap them from their usual position to get the generator to work so this isn't hard and fast.
When I say rotate I mean when I test motor it. What I do is once I've assembled the generator I use a battery to motor it and verify everything is hooked up properly. Ground to the generator body somewhere and also to the F terminal. Positive to the Reg terminal. The generator should motor clockwise when viewed from the brush end (counter clockwise from the gear end).
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