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Thread: 1986 BMW R80 Charging question

  1. #1
    Phil B bullfrog_28560's Avatar
    Join Date
    Aug 2012
    currently Germany

    1986 BMW R80 Charging question

    Hello all, I have read a bunch of charging issues, but my question was not addresed with other peoples problems. When I start up the bike first thing in the morning, at idle, charge light is on, above 1100 rpm, it goes off. After riding for about 10 minutes, the charge light stays off at idle. about an hour later if I start it up, same thing. My landlord here in Germany says that is normal. I dunno, I am just verifying. All contacts were cleaned, new battery, tested voltage, it is good. it does not undercharge or overcharge, it fluctuates with different RPM but does not over charge or undercharge. there is no key off battery drain. I know there are alot of more BMW experienced people than I, I am a descent mechanic, but not familiar with BMW bikes, but not afraid to tackle repairs or disassembly.
    Phil Bouffard
    SSG U.S. Army
    Kaiserslautern, Germany

  2. #2
    Registered User toooldtocare's Avatar
    Join Date
    Mar 2008
    DeLand Florida
    Pretty much what my airheads did. Just make sure that you are getting the correct charge voltage at 3,000 RPM (about 14 to 14.5) and you should be set. I have seen lower charge voltages and still be good, but I think a health system should be what I quoted.

  3. #3
    Registered User Anyname's Avatar
    Join Date
    Jun 2007
    Portsmouth, NH
    I have an 86 R80 that started life as an RT. The charge light does exactly the same thing as yours does.
    BMW R bike rider, horizontally opposed to everything...

  4. #4
    Registered User
    Join Date
    Jan 2011


    My 86 r80rt does the same thing as yours bullfrog.It charges at about 13.8 volts.with no problems.

  5. #5
    Registered User f14rio's Avatar
    Join Date
    Jan 2010
    mattituck new york


    "Enemy fighters at 2 o'clock!...Roger, What should i do until then?"

    2010 r1200r, 2009 harley crossbones, 2008 triumph/sidecar, 1970 norton commando 750

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