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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.
    Lee A. Dickinson - Danielsville, GA USA
    Airheads #3480 | Iron Butt Assn. #8914
    1992 R100RS - 1993 K1100RS - 2013 R1200GS

  3. #3
    Registered User lmo1131's Avatar
    Join Date
    Jan 2010
    Pismo Beach, CA
    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
    Join Date
    Apr 2008
    south of Los Angeles
    Start here and prepare to learn -

  5. #5
    Day Dreaming ... happy wanderer's Avatar
    Join Date
    Mar 2010
    Vancouver, B.C. Canada
    Quote Originally Posted by beemerphile View Post
    I recommend Rick Jones' book on Airhead Charging Systems for a comprehensive understanding of it.
    +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

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