[BrianG]

Just wire the + motor leads together into a Y adaptor, and the - motor leads together to another Y adaptor. How you hook up the MM depends on how you want to run it. There is a normal power for/rev/brake mode, and then hi power mode with only forward and brake.

To have F/R/brake, use the red MM motor wire and the black MM motor wire. The white is not used.

For hi power mode, you're gonna have to wire all three MM motor wires to the - motor terminals, and then the battery + will have to go to the motor + terminals.

It sounds confusing, but the MM manual has pictures which is much easier to understand.