Cleaning the generator and replacing the voltage regulator

Remove the negative terminal from the battery. Remove the generator from the engine.

Bosch K1-55A and K1-70A generators

Unscrew 2 screws and remove the regulator with brushes from the back of the generator (see fig. 5A.5, 5A.6).





Check brush length. If it is less than acceptable or close to the minimum, replace them by unsoldering the electrical connectors. Remove brushes and springs. Clean the alternator slip rings with a solvent-moistened cloth, check for wear and damage.




Installation is made in sequence, return to removal.

Generator Bosch NC 14V 60-90A

Unscrew 3 screws and remove the plastic end cap (see fig. 5A.8).



Unscrew the 2 screws securing the voltage regulator with brushes.

Remove the voltage regulator with brushes from the socket in the generator (see fig. 5A.9).



Measure the length of the brushes. Check that each brush moves smoothly and without binding in the socket.


Check that the alternator slip rings are clean. Wipe them with a cloth dampened with solvent and check for wear.

Installation is made in sequence, return to removal.

Generator Magneti-Marelli

Unscrew the 3 screws securing the regulator with brushes from the back of the generator and partially remove the regulator. Disconnect the connector and remove the regulator from the generator (see fig. 5A.12).



Measure the length of the brushes. If the brushes are worn out. it is necessary to completely replace the voltage regulator with brushes. brushes are not supplied separately.


Clean the alternator slip rings with a cloth dampened with solvent, then check the rings for wear and damage.

Installation is made in sequence, return to removal.

Mitsubishi Generator

Fasten the pulley and. using an 8 mm wrench, unscrew the pulley fastening nut (see fig. 5A.13).



Remove the pulley, fan, gasket and clean the front cover of the generator.





Mark the position of the stator front cover and alternator rear cover for proper reassembly. Unscrew the tie bolts and remove the front cover from the rotor shaft.


Remove the rotor from the rear cover and stator. If the stator cannot be removed, heat the back cover with a 200W soldering iron for 3-4 minutes.

Unscrew the bolt of fastening of the block of diodes and brushes from the rear cover of the generator (see fig. 5A.16).



Unsolder the stator and brushes from the diode block. using a low melting point soldering iron.

If the brushes are worn, replace them. Unsolder the wires from the brushes at the marked points, then solder the new brush in such a way that the soldering point does not extend beyond 2-3 mm from the end of the holder (see fig. 5A.17, 5A.18).





Clean the alternator slip rings with a cloth soaked in solvent. Check them for wear and damage.

Installation is done in sequence. reverse withdrawal. When installing the generator rotor, pull through the hole in the back cover of the generator brushes from the working position (see fig. 5A.19). After installing the rotor, release the brushes.