I guys..
last ear i have play a test with pololu jrk 21v3
Now i have buy 12v12 version and i do the same scheme.
pololu is recognized and the leds is green.
mi motor is ok.
when i connect it on transformer adapter it turn ok.
But.....
when i connect mi motor on pololu jrk 12v12, mi motor
don't turn.
please....
you can halp me?
Maybe is only power problem?
I do a test whit thrustmaster t500 wheel transformer adapter.