Intro: How to Turn the Stepper Motor Without a Driver.
You take a transistor, a variable resistance, the power supply to 12 volts, the connecting wires. Dismantle the engine, remove one of the coils, the two remaining connect according to the scheme. Turn on the power, change the resistance and turn the rotor by hand as long as the motor does not work on their own. If not working - change the polarity of the power supply circuit.