Battery issue?

Discussion in 'Mechanics Garage' started by linkken, Sep 20, 2021.

  1. linkken

    linkken New Member

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    Okay, so now I just had a problem with my battery! It just died not even a mile from my house!!
    So again I just got a 1992 and I am trying to figure this thing out.
    It is cold here in Montana right now so I let it warm up a little bit (maybe 5 min.) and then I have to let it idle down my dirt road for a ways. Well I did not even get to the pavement and it totally died. My guess is that it will not charge the batt. unless you have some RPMs.
    So my question is at what RPM does it charge and how long should it run on the battery alone before you get in trouble?
     
  2. fink

    fink Member

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    On a fully charged battery it should last a few hours.

    At idle it won’t be charging.
     
  3. Terry Smith

    Terry Smith Member

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    I would be putting the battery on a charger, then firing the bike up, and measuring the voltage across the battery terminals with the engine running. You should see something in the range 13.5-14.5V; anything lower and the charging system may be suspect e.g. a dead regulator/rectifier or a burnt out alternator. If the volttage looks OK then the battery is probably toast.
     
  4. ridervfr

    ridervfr Member

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    Granite Blue 92? gota see some pictures - check voltage when your starting bike. How old is battery?
     

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  5. linkken

    linkken New Member

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    I charged up the battery, it takes a full charge. (13.5v)
    With the meter still on when I start it it will drop down a little, then when I give it some revs my meter starts freaking out!
    Numbers jumping all over the place!!
     
  6. linkken

    linkken New Member

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    Okay I charged the batt. and rode it, it only lasted about an hour!
    It has some newer (not factory) wiring and what looks like a replacement rectifier/regulator?
    would it be just a bad alternator??
     
  7. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    gotta check the connectors, ohm out the stator, then figure out which component is bad. Common VFR issue.
     
  8. linkken

    linkken New Member

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    This thing is definitely not charging!
    I just put new higher wattage headlight bulbs in, would that have anything to do with it?
     
  9. linkken

    linkken New Member

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    ohms out of the stator? Would that be checking impedance on the stator itself?
     
  10. squirrelman

    squirrelman Member

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    study the factory service manual to learn how to test the AC stator output.

    and reaD "the drill"
     
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  11. linkken

    linkken New Member

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    Yeah, just like that with a Yoshi pipe!
    I'll get some photos soon, just still trying' to figure this thing out!!
     
  12. RllwJoe

    RllwJoe Member

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  13. linkken

    linkken New Member

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    Okay will do, thank you! what is "the drill"?
     
  14. squirrelman

    squirrelman Member

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    the drill is complete testing directions to sort out any charging problems. covers just about everything u might need to know.
     
  15. linkken

    linkken New Member

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    where do I find "the drill"?
     
  16. linkken

    linkken New Member

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    oh, I see. post #9 thank you!!!
     
  17. linkken

    linkken New Member

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    Good stuff, thanx y'all!!!
     
  18. linkken

    linkken New Member

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    So there is power coming from the stator to the r/r when I put the lead for my meter on the red wire out of the r/r it really @#%!s up my meter?
    what should it read at the red wire? something like over 14v right?
     
  19. linkken

    linkken New Member

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    One yellow wire reads 25v AC, one is 20v and the other is 18v is this good?
     
  20. Skipper

    Skipper New Member

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    When you say "I drop it down a bit and give it some revs and it starts feakin out. jumps all over the place"
    That sounds suspiciously like R/R to me. If the voltage test coming into the R/R from the Stator is consistant and correct across the three phases I would be buying a new Mosfet type regulator/rectifier and fitting it - worked for me, but then I never had a flat battery either, just blew a couple of headlamp bulbs.
    So - check the voltage output from the Stator first!
     
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