When the vehicle is moving under normal conditions, the charge control lamp does not light up. If the control lamp is on while driving, it is necessary to check the alternator or voltage regulator. First of all, check all wire connections on the generator.
Check alternator drive V-belt tension. If you have a voltmeter and an ammeter, you can perform the following checks:
Locate the wires on the back of the battery. The red wire is connected to the terminal "B+" generator, small blue wire with terminal "D+". For the first test, connect a voltmeter to the terminal "D+" and to the mass (do not disconnect the wire and do not turn on the ignition). Voltmeter readings "0".
Turn on the ignition and check that the voltmeter readings correspond to 1... 3 V. Otherwise, the cause is a malfunction of the voltage regulator or the generator winding.
Start the engine and bring the engine speed up to 2000 rpm. Connect a voltmeter to the voltage regulator. The voltmeter readings should be within 13.7... 14.5 V. If the readings deviate, the cause may be a malfunction of the voltage regulator or wear of the generator brushes. At high voltage (about 20 V) The diodes may have burned out.
Connect the ammeter to the terminal "B+" and weight and start the engine. Bring the motor shaft speed up to 1200 rpm and turn on the current consumers. The ammeter reading must correspond to at least 30 A. Perhaps the reason for the deviation in readings may be damage to the diodes. The remaining checks can be performed only after removing the generator.