2. Check the condition of all wires and connections.
3. Make sure that the indicator lamp lights up after turning on the ignition.
4. If the lamp does not light, check the lamp. To do this, disconnect the wire from the SL terminal on the generator, and connect the L terminal to ground. Turn on the ignition and if the lamp still does not light, then the lamp or wiring is faulty.
If the lamp lights up, then either the generator or the voltage regulator is faulty. Connect the wire to the SL terminal and connect the brushes to ground (photo, see below) If the control lamp lights up when the ignition is on, the regulator is faulty, otherwise the generator is faulty. Replace the faulty unit.
14.4 Fixing the brushes with a piece of wire
Information copied from the portal: Nissanbook.ru
5. If the indicator lamp lights up when you turn on the ignition, start the engine and let it idle. The lamp should go out. Otherwise, replace the generator.
6. Increase the speed to 1500 rpm and turn on the headlights. If the indicator lamp glows dimly, check the voltage between the B and L terminals of the generator.
If the voltage is less than 0.5 V, replace the generator.
If the indicator lamp does not light when the headlights are on, check the voltage at terminal B without reducing engine speed (make sure the connection to the S terminal is correct).
If the voltage is greater than 15.5 V, replace the voltage regulator.
7. If the indicator lamp lights up when the headlights are turned on at idle speed, replace the generator.