Author Showing 15.1V on idle  (Read 3099 times)

0 Members and 1 Guest are viewing this topic.

  • Offline JohnXR   ca

    • XR Junior  ‐    9
    • *
    • Topic Author

    Offline JohnXR

    • XR Junior
    • *
    • Topic Author
    • Posts: 9
    • Bike: 17 XR
    • Town: Toronto
    • Country: ca
    Showing 15.1V on idle
    on: March 26, 2021, 08:35:39 pm
    March 26, 2021, 08:35:39 pm
    Hi guys. Was getting some randoms errors flashing on the dash but never interfered with the operation of the bike. Today wanted to check the battery and it was reading at 13.1V when off and only dropped to 10V on startup but oddly it read as high as 15.6V and then stabilised at 15.1V on idle. I'm guessing that shouldn't be normal? Any ideas? Thank you. Bike is a 2017 with the factory alarm.

  • Offline wessie   gb

    • XR Master  ‐    622
    • ****
      #1

    Offline wessie

    • XR Master
    • ****
    • Posts: 622
    • Bike: 2016 XR SE Sport
    • Town: Cheltenham
    • Country: gb
    Re: Showing 15.1V on idle
    Reply #1 on: March 26, 2021, 10:08:21 pm
    March 26, 2021, 10:08:21 pm
    Ask a Honda owner. They see this more often than others. I suspect your voltage regulator that stabilises and rectifies the alternator output has died. You may find it has taken the battery with it.

  • Offline JohnXR   ca

    • XR Junior  ‐    9
    • *
    • Topic Author
    • #2

    Offline JohnXR

    • XR Junior
    • *
    • Topic Author
    • Posts: 9
    • Bike: 17 XR
    • Town: Toronto
    • Country: ca
    Re: Showing 15.1V on idle
    Reply #2 on: March 27, 2021, 12:19:06 pm
    March 27, 2021, 12:19:06 pm
    Looked into replacing the part and it looks easily doable especially with a center stand but the Haynes manual for the bike says 15V is normal. I will continue to monitor and see if anything changes. If anyone can quickly take a look at what their bikes are putting out at idle, that would be very helpful. Thank you.

  • Offline jskene   us

    • XR Pro  ‐    106
    • ***
      #3

    Offline jskene

    • XR Pro
    • ***
    • Posts: 106
    • Bike: S1000XR
    • Town: Baltimore, MD
    • Country: us
    Re: Showing 15.1V on idle
    Reply #3 on: March 27, 2021, 01:03:45 pm
    March 27, 2021, 01:03:45 pm
    I just checked my 2016 model (manufactured in late 2015). It still has the original battery and read 12.70 volts with the bike off and 14.74 volts at idle. No voltage change at all over a wide rpm range so good voltage regulation.

    I've often read that the normal operating voltage of "12 volt" vehicles is 14.3 volts, so BMW's is a bit high but nothing to worry about.

  • Offline orbits   gb

    • XR Pro  ‐    133
    • ***
      #4

    Offline orbits

    • XR Pro
    • ***
    • Posts: 133
    • Bike: S1000XR
    • Town: Cotswolds
    • Country: gb
    Re: Showing 15.1V on idle
    Reply #4 on: March 27, 2021, 07:09:22 pm
    March 27, 2021, 07:09:22 pm
    Enter a Honda owner  :001: I’ve an old VFR; part of ownership is learning about voltages a bit. Most wisdom suggests anything ‘high 14’s’ is getting a bit concerning and could be symptomatic of a failing RegRec. Eventually it’ll kill the battery which can also present as some weird voltage issues. A battery load tester can help here.
    My XR seems to hover around 14.70-14.75 and always has but I wouldn’t want it any higher tbh.
    Google ‘electrosport fault finding diagram’ for a go-to reference on finding electrical gremlins.
    HTH
    Last Edit: March 27, 2021, 07:10:21 pm by orbits

  • Offline JohnXR   ca

    • XR Junior  ‐    9
    • *
    • Topic Author
    • #5

    Offline JohnXR

    • XR Junior
    • *
    • Topic Author
    • Posts: 9
    • Bike: 17 XR
    • Town: Toronto
    • Country: ca
    Re: Showing 15.1V on idle
    Reply #5 on: March 27, 2021, 07:16:04 pm
    March 27, 2021, 07:16:04 pm
    Great info. Thanks guys. I rode around today for 2 hours with no errors whatsoever but upon reaching home I just wanted to check the voltage again and it was still reading 15.1V on idle. Will keep an eye on it and have ordered a voltmeter that connects to my tender plug. If it gets any higher than 15.1V during idle i'll look for professional help. Any additional info would be helpful. Thanks

  • Offline orbits   gb

    • XR Pro  ‐    133
    • ***
      #6

    Offline orbits

    • XR Pro
    • ***
    • Posts: 133
    • Bike: S1000XR
    • Town: Cotswolds
    • Country: gb
    Re: Showing 15.1V on idle
    Reply #6 on: March 27, 2021, 07:55:23 pm
    March 27, 2021, 07:55:23 pm
    What does the voltage read at 5000rpm?

    It should ideally be constant across the Rev range but I’ve seen various RegRecs do better than others at this, and some tend to reduce voltage a bit as you move away from idle. Which tbh is probably a favourable situation, as bikes spend most of their run-time north of idle.


  • Offline JohnXR   ca

    • XR Junior  ‐    9
    • *
    • Topic Author
    • #7

    Offline JohnXR

    • XR Junior
    • *
    • Topic Author
    • Posts: 9
    • Bike: 17 XR
    • Town: Toronto
    • Country: ca
    Re: Showing 15.1V on idle
    Reply #7 on: March 27, 2021, 08:25:42 pm
    March 27, 2021, 08:25:42 pm
    I checked at 5000rpm it was reading at 14.6V to 14.8V and around 2500rpm it was reading as low as 9.XV

  • Offline JohnXR   ca

    • XR Junior  ‐    9
    • *
    • Topic Author
    • #8

    Offline JohnXR

    • XR Junior
    • *
    • Topic Author
    • Posts: 9
    • Bike: 17 XR
    • Town: Toronto
    • Country: ca
    Re: Showing 15.1V on idle
    Reply #8 on: March 27, 2021, 08:29:13 pm
    March 27, 2021, 08:29:13 pm
    I will check again with a friends meter which is nicer than mine and report back. Thanks

  • Offline philbuck   gb

    • XR Pro  ‐    220
    • ***
      #9

    Offline philbuck

    • XR Pro
    • ***
    • Posts: 220
    • Bike: S1000XR Sport SE
    • Town: Cheshire
    • Country: gb
    Re: Showing 15.1V on idle
    Reply #9 on: March 27, 2021, 08:35:02 pm
    March 27, 2021, 08:35:02 pm
    I'm sure mine reads the same sort of voltage, and everything seems ok (kiss of death there!)