To make sure that the voltage regulator is working properly, turn off all consumers except the high beam headlights and measure the voltage at the battery terminals
It should be in the range of 14.4 - 15.1 V, at an engine speed of 3000 min -1.
If the voltage differs from the specified one, the regulator must be replaced.
You can remove the brush holder with the regulator without removing the generator from the car.
Disconnect the wire terminal from the negative terminal of the battery.
Disconnect the wiring harness block from the generator.
Remove the protective rubber cover and use a 13 mm socket wrench to unscrew the nut securing the wire lugs to terminal “B+” of the generator.
Remove the ends of the two wires from the contact bolt.
Release the three spring clamps securing the casing of the rectifier unit (shown on the removed generator) and remove the casing from the generator.
Disconnect the voltage regulator wire block from the output of the rectifier unit
Use an 8 mm socket wrench to unscrew the two bolts securing the voltage regulator
Use a 12 mm open-end wrench to unscrew the contact bolt nut
Disconnect the lead from the contact bolt and remove the voltage regulator
Install the voltage regulator in the reverse order of removal.
Before installing a voltage regulator that is in operation, inspect the brushes and make sure they are mobile.
If the brushes are broken or badly worn (protrude no more than 5 mm from the brush holder), or they are wedged in the brush holder, the regulator must be replaced.