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Thread: Low voltage output from Regulator Rectifier unit

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    Default Low voltage output from Regulator Rectifier unit

    My CT100's RR unit is giving only 5 to 8 volt output. It doesn't increase beyond 8v on increasing RPM. Therefore, the battery is not charging and the horn is not working. I changed the RR unit to a new one but I am still getting same values. Stator coil AC output is 10 to 60 volt.

    What could be the problem? Please help!
    Last edited by xBhp; 08-09-2019 at 11:42 AM.

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    Default Re: Low voltage output from Regulator Rectifier unit

    Thread approved.

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    Default Re: Low voltage output from Regulator Rectifier unit

    Anyone willing to help me with his knowledge?

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    Default Re: Low voltage output from Regulator Rectifier unit

    Quote Originally Posted by SkpMech View Post
    Anyone willing to help me with his knowledge?
    I will test and let you know.

    My charging system is good.

    I will tell you the values I get.

    Did you test the new RR in diode mode?

    I was working on my Jawa, the replacement RR was bad too.

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    Default Re: Low voltage output from Regulator Rectifier unit

    Quote Originally Posted by rk1685 View Post
    I will test and let you know.

    My charging system is good.

    I will tell you the values I get.

    Did you test the new RR in diode mode?

    I was working on my Jawa, the replacement RR was bad too.
    I have tested RR in both diaode and resistance mode. In diaode test Yellow and Yellow-Red wire gives 0 value while others doesn't give any values.

    In resistance test. Every wire combination gives resistance in mega ohms (0.7 to 1 mega ohm) except Yellow and Yellow-Red wire which gives zero resistance.

    I don't know what values should a healthy RR unit should give.

    I have attached the image of RR unit.

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    Resurgam
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    Default Re: Low voltage output from Regulator Rectifier unit

    Quote Originally Posted by SkpMech View Post
    My CT100's RR unit is giving only 5 to 8 volt output. It doesn't increase beyond 8v on increasing RPM. Therefore, the battery is not charging and the horn is not working. I changed the RR unit to a new one but I am still getting same values. Stator coil AC output is 10 to 60 volt.

    What could be the problem? Please help!
    For my bike, AC output is between 26 - 59 Volts.
    Check attached snapshots.

    For RR unit:
    Red lead connected to white wire
    Black lead to yellow wire.

    Unchanged values for diode function.

    Battery voltage:
    At rest and key in off position: 12.4V (Battery age - nearly 2 years old I guess)
    At rest and key in on position: 12.3V
    At Idling: 12.5V
    At approx. 4-5K rpm: 13.7V

    Yellow-Red wire connectors were stuck and I didn't have time enough to disconnect, had to change my accelerator cable and clean the carb.Name:  IMG_20190812_180516.jpg
Views: 67
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Size:  21.6 KBName:  IMG_20190812_180555.jpg
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Size:  19.2 KB

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    Default Re: Low voltage output from Regulator Rectifier unit

    Quote Originally Posted by rk1685 View Post
    For my bike, AC output is between 26 - 59 Volts.
    Check attached snapshots.

    For RR unit:
    Red lead connected to white wire
    Black lead to yellow wire.

    Unchanged values for diode function.

    Battery voltage:
    At rest and key in off position: 12.4V (Battery age - nearly 2 years old I guess)
    At rest and key in on position: 12.3V
    At Idling: 12.5V
    At approx. 4-5K rpm: 13.7V

    Yellow-Red wire connectors were stuck and I didn't have time enough to disconnect, had to change my accelerator cable and clean the carb.Name:  IMG_20190812_180516.jpg
Views: 67
Size:  21.8 KBName:  IMG_20190812_180508.jpg
Views: 72
Size:  21.6 KBName:  IMG_20190812_180555.jpg
Views: 66
Size:  22.0 KBName:  IMG_20190812_175947_01.jpg
Views: 65
Size:  19.2 KB
    I didn't understand this line - "Unchanged values for diode function".
    What values you are getting in diode test?

    I am not getting any reading between white and yellow wire in diode test. It just showing 1 (means infinity).

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    Default Re: Low voltage output from Regulator Rectifier unit

    Quote Originally Posted by SkpMech View Post
    My CT100's RR unit is giving only 5 to 8 volt output. It doesn't increase beyond 8v on increasing RPM. Therefore, the battery is not charging and the horn is not working. I changed the RR unit to a new one but I am still getting same values. Stator coil AC output is 10 to 60 volt.

    What could be the problem? Please help!
    Replace ACG.

    ----consecutive posts auto-merged-----

    Quote Originally Posted by SkpMech View Post
    My CT100's RR unit is giving only 5 to 8 volt output. It doesn't increase beyond 8v on increasing RPM. Therefore, the battery is not charging and the horn is not working. I changed the RR unit to a new one but I am still getting same values. Stator coil AC output is 10 to 60 volt.

    What could be the problem? Please help!
    If your battery is ok.
    Replace ACG

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    Default Re: Low voltage output from Regulator Rectifier unit

    Quote Originally Posted by curse View Post
    Replace ACG.

    ----consecutive posts auto-merged-----


    If your battery is ok.
    Replace ACG
    Yes that is the last option I will do. My battery is discharging when connected to motorcycle. Because charging voltage is only 8 to 10 volts.

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