This is so simple, I feel kind of foolish posting it, but here goes:
I need a wiring diagram for my garden-variety 3/8" variable-speed
reversible drill. (It happens to be a Craftsman, but is the same as
hundreds of other similar tools.)
Years (decades, actually) ago I replaced the speed control which I got
from Sears. The drill has worked since, but not correctly, so evidently
I screwed up when I put it back together. I think I had to resolder some
wires to the reversing switch, which is where I think the problem is.
Here's the deal: it works, but not like it used to. At slow speeds, it
feels like it's "chugging" or cogging. No sparks from the brushes. At
medium speeds it runs a little smoother with minimal sparking, about
what you'd expect. At high speed, it runs with a lot of sparking, more
than it should.
The commutator is in good condition: I cleaned it and scraped out all
the built-up crap between the contact bars. Brushes are in good shape.
Field and armature coils are all good (tested with ohmmeter).
So I'd sure appreciate it if someone could post a (link to) a wiring
diagram for this tool. Like I said, any similar variable-speed
reversible consumer-quality drill will do.
Please resist the urge to post if you want to tell me
* to buy a new tool (this is my favorite drill)
I ought to learn a whole lot more about electricity
* I should leave this kind of repair to "professionals"
I should have noted the wiring when I first opened it up.
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