Volvo RWD 200 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 5/2007 200 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

checking diodes in voltage regulator ? 200 1987

posted by  riverbend on  Thu Jan 24 07:55 CST 2013
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Wed Oct 22 15:29 CST 2014
[RELATED]

Is there a way to check the diodes in the alternator mounted voltage regulator ? One of the brushes was worn down to 5/32" ( 0.156") but I don't want to replace the brushes if one of the diodes is bad.

The orginal problem was no charge, no warning lights (except oil pressure). Replacing the VR/brush assembly solved the problem.

Thanks

Greg







  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    checking diodes in voltage regulator ? 200 1987

    posted by  runwld2 on  Thu Jan 24 08:38 CST 2013
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Tue Sep 30 13:11 CST 2014
    [RELATED]

    The diodes are not in the voltage regulator, they are in the alternator.
    So go ahead and replace the brush, both of them in fact, they are cheap, but do require soldering (and unsoldering) skills to remove and install.

    If you search online, or maybe in the FAQ, you should find a test procedure for the diodes. The typical symptom is flickering lights caused by the high ripple on the DC output.
    --
    93 245CL M47 IPD bars, 91 245SE AW71, 89 745 16v M46 IPD bars, 00 S&V40s








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      checking diodes in voltage regulator ? 200 1987

      posted by  riverbend on  Thu Jan 24 19:06 CST 2013
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Wed Oct 22 15:29 CST 2014
      [RELATED]

      Interesting. The diodes are probably fine since the alternator works and puts out decent DC voltage. Is there any way to check the regulators or don't they ever go bad ?

      Greg







      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        checking diodes in voltage regulator ? 200 1987

        posted by  runwld2 on  Sat Jan 26 20:38 CST 2013
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Tue Sep 30 13:11 CST 2014
        [RELATED]

        The regulators do go bad.
        There could be a way of checking them off the alternator, but I check them by installing them and then check the voltage at the battery.
        I regard them as fairly cheap, so I'd just get a new one.
        Replacing the brushes is definately worth it if you are willing to spend the time and can solder.
        --
        93 245CL M47 IPD bars, 91 245SE AW71, 89 745 16v M46 IPD bars, 00 S&V40s







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.