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Thread: Charging troubleshooting

  1. #1

    Charging troubleshooting

    1970 R75/5 Gen light on when riding. It seemed to function fine when I first got this bike running. I had it disassembled for paint. Everything is working fine with the exception of charging. I can tell that there is no charging, as after a 20 mile or so ride the battery will take a charge for a while (more than an hour) from my CTEK. I keep the rpms up above 4k when riding.
    Is there a progressive troubleshooting path to follow?

    Thank you.

  2. #2
    I recommend Rick Jones' book on Airhead Charging Systems for a comprehensive understanding of it.

    http://www.motoelekt.com/goodstuff.htm
    Lee A. Dickinson - Danielsville, GA USA
    Airheads #3480 | Iron Butt Assn. #8914
    1976 R75/6 - 1992 R100RS - 1993 K1100RS - 2013 R1200GS

  3. #3
    Registered User lmo1131's Avatar
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    How old is the battery?

    Check all your ground points on the frame for paint build up.
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  4. #4
    MOA #24991 Pauls1150's Avatar
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    Start here and prepare to learn - http://bmwmotorcycletech.info/boxerelectrics.htm

  5. #5
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by beemerphile View Post
    I recommend Rick Jones' book on Airhead Charging Systems for a comprehensive understanding of it.

    http://www.motoelekt.com/goodstuff.htm
    +1 on the Rick Jones booklet. Has a flowchart that takes you through component testing step by step. This takes the guess work out of charging system diagnostics.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  6. #6
    OK, so you took stuff off the bike to paint the frame and then put stuff back on and now it doesn't work right. Rule 2 is to always go back and check your prior work. Diode board connections? Grounding? Alternator wiring correct? Voltage regulator wiring OK? And so forth.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

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