Have you selected the "Enabled" (green tick) in mach3 ports n pins - motor Outputs.? This is all you need to do in Motor Outputs, forget the Step/Dir and Port pin numbers etc they are not used, (except the active high if need to change the step edge which can get into later if needed )

That's all you need to do for the motors to work. Then you just set the steps per and tune the velocity etc in motor tuning.

Also, watch those straggling wires, if they short you'll blow the drives.!