1. Disconnect the wire from the negative battery terminal.
2. Remove the air filter and, depending on the configuration, remove the air conditioning compressor without disconnecting the tubes. Depending on the model, it may be necessary to remove the alternator.
3. Turn away screws of fastening and remove a box of a regulator of tension and brushes of a back part of the generator.
4. If the height of any of the brushes is less than the minimum (5 mm), unsolder the lead wires and remove the brushes and springs.
5. Wipe the alternator slip rings with a cloth soaked in gasoline. If they are heavily soiled, clean them with fine-grained sandpaper (10-M40) and wipe with a cloth.