1991 325 Charging Problem

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  • Rajun Cajun
    Noobie
    • Mar 2011
    • 17
    #1

    1991 325 Charging Problem

    My '91 325 M Technic has a charging problem and the symptons are simular to a post on the DIY as the dash trouble lights blink dimley and the electronics act crazy. I pulled the alt out and checked the brush length and they were 12mm long which is ok.
    I have a brand new battery installed but have the same problem even when fully charged. The alt is a Valeo # 2541114 and I'm not sure where the best place to buy a new one would be.
    Has anyone had this problem or can help point me to a good parts place I would appreciate it.

    Thanks,

    Andy Johnson
    Tags: None
    • AndrewBird
      The Mad Scientist
      • Oct 2003
      • 11892
      #2
      Measure the voltage at the battery with the car running. Should be ~14v. With the car off, it should be at least 12.5v.

      Even if the brushes are in good shape, the voltage regulator might have died.

        Comment

        • Rajun Cajun
          Noobie
          • Mar 2011
          • 17
          #3
          I did that once but don't remember the exact voltage value but don't think it was 14V maybe 13V.
          I will put the alt back together and measure it again.
          Do you know where I can get parts for a Valeo alt?

          Thanks,

          Andy J

            Comment

            • Rajun Cajun
              Noobie
              • Mar 2011
              • 17
              #4
              I reassembled the alt and had 14.2V with the engine at idle. At 2000 rpm the voltage dropped to 13.2 and headlights on 12.8V
              I checked with my O scope and had no AC ripple voltage so I will assume the diodes are good.
              Time to try and find a voltage regulator. Thanks for the help

              Andy J

                Comment

                • reelizmpro
                  R3V OG
                  • Dec 2003
                  • 9437
                  #5
                  Hey Andy, we spoke on bimmerfest.com. Sounds like a voltage regulator issue. Most of the time, its worn brushes. Check the belt tension as well.
                  "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

                  85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
                  88 M3 - LACHSSILBER/SCHWARZE
                  89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
                  91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

                    Comment

                    • Rajun Cajun
                      Noobie
                      • Mar 2011
                      • 17
                      #6
                      Hey Brad, how have you been? It's been a while!
                      I pulled the voltage reg out and checked the brushes, they were 12mm long. I'm with you though as I think it's the voltage reg.

                      Do you know where I can get parts for this Valeo alt?

                      Thanks, Andy

                        Comment

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