Intermittent Stator

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  • Guest
    #1

    Intermittent Stator

    I noticed my charging system was only outputting ~ 12.8V at idle and low 13s at higher. I did a full check of the charging system and everything was in spec. I replaced the battery with a new one and all seemed good or so I thought. Soon after the output voltage dropped. I pulled things apart again and the stator is only outputting abut 18VAC at idle and ~50 VAC at higher RPM. resistance is 0.6 ohms coil to coil and no shorts to ground. Stator is a Ricks ~ 1 year old. This is intermittent but mostly in the faulty state. Anybody have anything else I could check before I replace it and also what the root cause may be?

    Thanks,
    Dave
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    • posplayr
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      • Dec 2007
      • 23673
      • Tucson Az
      #2
      Test shorts to ground at 5k rpm. Part of the revised phase b tests.

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        • Guest
          #3
          Originally posted by posplayr
          Test shorts to ground at 5k rpm. Part of the revised phase b tests.

          Posplayr,

          Is it necessary to perform the test with a load or can I do it unloaded?

          -Dave

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            • posplayr
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              • Dec 2007
              • 23673
              • Tucson Az
              #4
              Originally posted by 5azzmonkey
              Posplayr,

              Is it necessary to perform the test with a load or can I do it unloaded?

              -Dave
              As the link states can be done either way; the unloaded test is a pretty stressing test because it has the highest voltage to breakdown the insulation. The loaded test puts current through which will heat the unit if the insulation breakdown is temperature dependent.

                Comment

                • Guest
                  #5
                  OK re-checked my readings for leg to leg -- the 50 VAC reading I initially took was only at ~3.5K RPM at 4.5K RPM its ~70 VAC and at ~5K RPM it's 75VAC.

                  For leg to ground it's about 1/2 the leg to leg Voltage at 4.5K RPM it reads ~35VAC for each leg

                  Starting to think it's not the stator but the regulator (Compufire), which is also only about a year old!!!!

                  -Dave

                    Comment

                    • posplayr
                      Forum LongTimer
                      GSResource Superstar
                      Past Site Supporter
                      • Dec 2007
                      • 23673
                      • Tucson Az
                      #6
                      Originally posted by 5azzmonkey
                      OK re-checked my readings for leg to leg -- the 50 VAC reading I initially took was only at ~3.5K RPM at 4.5K RPM its ~70 VAC and at ~5K RPM it's 75VAC.

                      For leg to ground it's about 1/2 the leg to leg Voltage at 4.5K RPM it reads ~35VAC for each leg

                      Starting to think it's not the stator but the regulator (Compufire), which is also only about a year old!!!!

                      -Dave
                      Re read my post leg (sorry another thread) ground should be zero (ie isolated, OL, high resistance) 35vac is a short to ground; replace stator call me in the morning.

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