series parallel motors.
 

I am a bit fuzzy on just what happens when dc motors are placed in series or parallel connections.

I would appreciate it if I could be pointed to some material on this subject.
thank you.

Motors are no different than a resistor. If you put them in parallel they each take half the amps. If you put them in series, they each take half the voltage.

I believe wiring them in series makes for an open diff if used as the front or rear wheels of a vehicle. Wired in parallel makes for a positive lock like experience if you use the same motor a left and motor a right wheel and the motors are wired up as such.

Am I right? :confused:

There is some confusion about how two motors would operate at different wheels. Without some kind of feedback circuitry the motors would operate independently. Yes, given the same power two similar motors will have similar output. If placed under different loads motors in parallel could draw different amounts of current which affects the torque. I would look at the circuitry of the earthmovers with motors in each wheel.

thank you folks, I appreciate the info.