battery volts

Discussion in 'Electrical' started by kpstar212, Mar 14, 2012.

  1. kpstar212

    kpstar212 Member

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    I have read several different articles on batterys and I am looking to see what a good voltage is o9n battery after sitting a few days. Some say 12.5 and others say 12.6. I have checked my battery and it is at 12.5. Should I be concerned with replacing it before summer hits. Bike starts but does seem a little slower to turn over before it fires. Just don't want to get stuck some where.

    Thanks,KP
     
  2. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    Fully charged battery should show 12.7V. Take your to your Harley dealer and have it load tested.
     
  3. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

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  4. kpstar212

    kpstar212 Member

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    Just checked after bike sat for two days after charging. V at 12.8 Started up with meter on battery and looked like it droped to 10.5. At idle shows 14.5 v and at 2000 rpm shows 14 v. when I took it up to 3000 rpm volts droped to 12.85 alittle further at 4000 rpm it showed back to 14.5 volts. I am usually riding around 3000 rpm. Could there be some sort of flat spot where I am not getting a full charge in that rpm range ?
     
  5. kpstar212

    kpstar212 Member

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    Thanks for the input all. Wondering also would I get a diagnostic fault showing if something was wrong ?
    It is a 2004 fxdli
     
  6. Hoople

    Hoople Account Removed

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    I would not rely on a DTC for this type of problem. A code won't help you at all because it won't tell you exactly what is wrong. The closest diagram I have is for a 2003. If yours is similar,,
    1) Replace that circuit breaker with a NEW one & make sure ring terminals are clean. Or better yet install a Maxi fuse instead of a new breaker.
    2) Later models have a dedicated ground wire for the regulator. If yours is like the diagram (only 3 wires not 4), make absolutely sure the grounding of the regulator to frame is clean & tight. If you do have a 4 wire regulator, make sure the grounding wire is clean & tight.
    3) Make sure connector 46A-46B is clean and tight.
    4) Battery grounding cable to frame (#70103-96) must be clean & tight. Also check Battery positive stud on the starter is clean & tight.

    If you still have similar voltage readings @ different RPM, cross check your meter with another meter.
     

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  7. kpstar212

    kpstar212 Member

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    Thanks for the help. I appreciate it.