In article ,
Daniel Rudy wrote:
I have some additional information. The black and white wires are
connected to brushes. The DC resistance between the two is about 2.7
ohms. The red and yellow wires have a DC resistance of 7.3 ohms. So I
guess they can be wires either series or parallel. What I don't
understand is if the red and yellow wires are for the field, then why
bring them out? Why not just connect them internally?

Think the way they are connected - series or parallel - makes a difference
to the motor characteristics. Also separate access to the field can make
speed control easier.

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*Everybody lies, but it doesn't matter since nobody listens*

Dave Plowman London SW
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