Just buy another drill. They're cheap.

If you insist on doing this repair, you really should learn more about
electricity before you tackle the job. You could be electrocuted.
Spend the winter going to a technical college. Since you obviously
lack that knowledge, dont touch it until you get an education on
electricity.
Otherwise, take it to a professional repair shop, but be prepared to
pay more than the worth of the drill. But you reap what you sow. If
you had left the pros do the job in the first place, or at least
labelled the wires, you would not have this problem now. I hope you
learned from this mistake.

If by chance you figured out how to procreate, you could always send
the drill to your sons Junior High School for their electricity
classes. They'll take it apart, learn from it, and then repair it for
you. (for free).

Tom

---------

On Fri, 01 Dec 2006 14:04:57 -0800, David Nebenzahl
wrote:

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.