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@Gordon
Hi! Thanks for trying without Pin.mode and for posting the motor driver datasheet.
That all looks good...
Just to check you're sure the GND connection is definitely common between the driver and the MDBT42Q board?I guess the grey wire going to VMotor should do it at least as far as I can tell from the circuit diagram, but it might be worth checking with a meter just in case?
You could also try checking the 'FLT/fault' wire's output when it's running in case anything shows there, and maybe check the voltage on the outputs? It might be it's all working but there's an issue with the motor or wires after all that.