i need battery help

Discussion in 'Mechanics Garage' started by mike alexander, Jul 20, 2019.

  1. mike alexander

    mike alexander New Member

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    86 vfr 750 new battery 60 days ago fully charged 12,9 volts on the bench key on not running high beam on for 45 sec drops 11.2 cranking [kill switch off ] 9.5 volts
    running 500 rpm 12.3 4500 rpm 11.2 what do i need to fix my baby
     
    mike alexander, Jul 20, 2019
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  2. fink

    fink Member

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    4500 revs it should be reading around 14.5v the charge coming from the reg rec.


    Could be a duff battery. You never mentioned manufacturer of battery.
     
    fink, Jul 21, 2019
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  3. mike alexander

    mike alexander New Member

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    its a crank battery (it was cheep $35 out the door with a years warranty figure cant go wrong ) thinking is not my strong point
     
    mike alexander, Jul 21, 2019
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    fink and Thumbs like this.
  4. squirrelman

    squirrelman Member

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    do an AC voltage check of stator output, should be between about 10 volts at idle up to 65 volts at 5000 rpm. if stator check is good, r/r is probably bad. also, inspect red plug on starter relay for melting or burning which will reduce charging voltage.

    july 1 2019 018.JPG
     
    Last edited by a moderator: Jul 21, 2019
    squirrelman, Jul 21, 2019
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  5. mike alexander

    mike alexander New Member

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    the red one was fine the yellow one was burnt fixed it now i have 14 volts at 500 rpm but drops to 13.2 when reved up my battery fully charged
    is 13.6 v
    with just the headlight on for 30 sec drops down to 10.6 v then it takes 1,5 min to recover to 12.8 v would my battery have a weak cell
     
    Last edited: Oct 13, 2019
    mike alexander, Jul 26, 2019
    #5
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