Last friday I bought my second 37D mm Gearmotor (more specific this one pololu.com/product/1444).
However it won’t start. I was going to hook it up to a power supply at my university to look at the encoder values using a oscilloscope, but I did not get that far. When I just connected the red and black wires to the power supply I saw a voltage drop (to near 0V from about 5V) and an increase in current (don’t remember exactly the current, because I removed the cable as fast as possible).
I suspect that something is short circuited. But this is the first time I connect the motor. However I have physically mounted the motor into my chassis and some of the cables became worn (but the cables themselves are not shorted). When I tested the motor with the power supply it was not mounted into my robot.
Between the red and black wire I measure 30 ohm at the broken motor and 5 ohm at the working.
How can I further investigate this?
Can it be the capacitor that is broken?
Thanks in Advance!