Voltage Regulator: Service and Repair

12 32 501 Replacing voltage regulator







Necessary preliminary tasks:
- Switch off ignition
- Disconnect battery negative lead 12 00 ... Instructions For Disconnecting and Connecting Battery
- Notes on removing and installing electronic control units
- Remove alternator







Bosch:
Release protective caps (1).







Bosch:
Release screw (1) and nuts (2), remove cover.







Bosch:
Release screws and remove regulator switch (1) in direction of arrow.







Bosch:

Installation:
Clean contact surfaces and check pretension of contact spring, replace regulator switch if necessary.
Measurement A = min. 5 mm

Check collector ring for wear and recondition if necessary.

Valeo:
Slacken nut (1).







Slacken nut (2).
Release screws (3).
Release cover (4).







Valeo:
Release screws.
Remove regulator switch (1) towards top.







Valeo:

Installation:
Clean contact surfaces and check pretension of contact spring, replace regulator switch if necessary.
Measurement A = min. 5 mm.

Check collector ring for wear and recondition if necessary.







Installation:
Fit new regulator (1) with attached mounting sleeve (2) or locked carbon brush.

Pull off mounting sleeve (2) and replace with cover (3).