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Originally Posted by railerobotics
THe speed controllers work fine but the motors do not spin. I'm guessing its a programming problem so I'll post a question there.
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If the LED on the controller goes from Orange to Green or to Red (indications that the controller is putting out full power) then the controller is working. If the motor is not turning under these conditions, then the wiring to the motor is defective. Suspect a bad crimp or a crimp over the insulation and not the wire. As a quick check, a voltmeter should show +12 volts when the controller LED is full on Red or Green. There is another possible problem. If you have wired the circuit breakers in place as shown in the robot power distribution drawing (of course you have) and you hear a buzzing noise after you have pushed the joystick full forward or reverse, then the motor is stalled. Try to wire any motor that is not mounted on the robot to the controller instead of the one you are trying to drive. If that motor turns, then you should suspect motor wiring or a stall condition on the motor that is installed.