Removal
1. With a spanner by 8 mm unscrew the three bolts connecting the stator winding terminals to the rectifier unit (1) and another bolt securing the rectifier unit (2) (note how the insulating and thrust washers are installed).
2. Using a Phillips screwdriver, unscrew the screw securing the capacitor.
3. Carefully bend the stator winding terminal wires to the side.
4. Remove the rectifier unit together with the capacitor.
5. With a spanner by 10 mm we unscrew the nut securing the contact bolt.
6. Remove the spring washer, spacer sleeve, insulating washer and capacitor wire tip from the bolt.
Examination
Note: A good semiconductor diode conducts current in one direction only. If the diode does not conduct current or conducts current in both directions, it is faulty.
1. To check additional diodes, connect the positive lead of the ohmmeter (in diode test mode) to the common bus of the additional diodes (1), and the probe of the negative terminal to the terminal of the diode being tested (2). A serviceable diode should not pass current (resistance tends to infinity).
2. Change the tester probes. If the diode is working properly, the ohmmeter should show the presence of resistance (several hundred ohms). We check the other two additional diodes in the same way.
3. Connect the probe of the negative terminal of the ohmmeter to the plate of the rectifier block, into which the diode being tested is pressed, and the probe of the positive terminal to the diode terminal. A serviceable diode should not pass current (resistance tends to infinity).
4. Swap the tester probes. If the diode is OK, the ohmmeter should show a resistance of several hundred ohms.
5. We check other diodes of the rectifier block in the same way.
Note: Capacitor capacity can only be measured with a special device. You can verify the capacitor is faulty using an ohmmeter with a measurement limit of at least 1000 kOhm.
6. Connect an ohmmeter to the capacitor terminals and observe its readings. If the capacitor is not "broken", then when connecting the terminals of the device to it, the ohmmeter will initially show a small resistance, then this resistance will quickly increase until it stabilizes. A similar change in the ohmmeter readings should be repeated when changing the polarity of the device.
We replace the faulty rectifier unit and capacitor.
The original source is published on the website VAZbook
Installation
We install the rectifier block and capacitor in the reverse order of removal.