(1) Incorrect wiring, disconnected wiring, poor contact. (2) Opening of the rotor winding. (3) Damage to the rectifier diode. (4) Poor contact of carbon brush. (5) Damage to the regulator.
(1) Checking the circuit. (2) Inspection and repair or replacement of the generator assembly. (3) Replacing the diode (4) Removing dirt, replacing the carbon brush (5) Repairing or replacing the regulator.