Results 1 to 11 of 11

Thread: What voltage should I be seeing on my R1200RT battery when it's running

  1. #1
    Registered User tasslehawf's Avatar
    Join Date
    Feb 2016
    Location
    Austin, TX
    Posts
    62

    What voltage should I be seeing on my R1200RT battery when it's running

    I suspected that the stator may have lead to the death my battery. I got my new battery in just now and started 'er up and I'm seeing 13.85 volts on the battery terminals. Shouldn't it be higher (like 14.3 or something). What is the work of replacing the stator on the R motor?
    2014 Triumph Speed Triple
    2007 F800S
    2006 R1200RT

  2. #2
    Registered User drneo66's Avatar
    Join Date
    Jun 2009
    Location
    Rochester, MN
    Posts
    449
    Was the 13.85 volts at idle (1200 rpm's or so)?

    (It's also an alternator, not a stator)
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

  3. #3
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    Location
    Mansfield,MA
    Posts
    14,160
    Your reading sounds good to me. You may get a bit more at higher RPM’s.

    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  4. #4
    Registered User tasslehawf's Avatar
    Join Date
    Feb 2016
    Location
    Austin, TX
    Posts
    62
    Quote Originally Posted by drneo66 View Post
    Was the 13.85 volts at idle (1200 rpm's or so)?
    Yes at idle.
    2014 Triumph Speed Triple
    2007 F800S
    2006 R1200RT

  5. #5
    Registered User tasslehawf's Avatar
    Join Date
    Feb 2016
    Location
    Austin, TX
    Posts
    62
    Potentially unrelated, but on my way to work the bike just died completely. Battery voltage is still good so it's a mystery.
    2014 Triumph Speed Triple
    2007 F800S
    2006 R1200RT

  6. #6
    Registered User drneo66's Avatar
    Join Date
    Jun 2009
    Location
    Rochester, MN
    Posts
    449
    Yay!! Electrical gremlins are fun!

    What was the history of the battery that you replaced?


    You can load test the battery:

    "Your local automotive shop is more than able to load test your battery for you. But it's quite easy to do at home. All you need is a digital voltmeter. For any load test to be accurate, the battery must be fully charged. Let's use a motorcycle battery for an example:

    Remove the seat and expose the battery in your bike so that you have access to the terminals. Do not disconnect the battery because you will attempt to start the bike.
    Hold the prongs of you voltmeter to the correct terminals on the battery.
    Now push the start button and watch what the voltage drops to. It doesn't matter if the bike starts or not, what you're looking for is a voltage reading.
    A healthy 12 volt motorcycle battery should maintain a range from 9.5 - 10.5 volts under the load for a good 30 seconds straight. If the battery begins to hold and then steadily drops in voltage, there is a problem. If the voltage instantly drops to 0 volts, that is also a problem. We call this the open cell. On a new battery, this can be a result of manufacturing flaws, but it also may be caused by sulfate crystal buildup."

    Taken from: https://www.batterystuff.com/blog/ho...ry-is-bad.html
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

  7. #7
    Registered User tasslehawf's Avatar
    Join Date
    Feb 2016
    Location
    Austin, TX
    Posts
    62
    The old battery I replaced ran perfectly for 2 years and then it was at 4.89 volts with the bike sitting for a week. It ran fine the week before, but sat for a week over the holidays.

    The new battery sits about 13.5 - 14.1. I noticed the battery seems to slowly drop as the bike idles.

    I noticed these two fault codes related to the battery. The over-voltage one is disturbing:

    41704 : KL30 (Battery positive) under voltage
    Currently present : NO
    Symptom : Signal or value under threshold
    Engine warning light (MIL) : NO
    Frequency count : 1
    Logistic(Healing) count : 39
    Fault Code History : Unknown
    |
    41758 : Battery Positive (KL30) over-voltage
    Currently present : NO
    Symptom : Signal or value over threshold
    Engine warning light (MIL) : NO
    Frequency count : 6
    Logistic(Healing) count : 40
    Fault Code History : Unknown
    2014 Triumph Speed Triple
    2007 F800S
    2006 R1200RT

  8. #8
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    Location
    Mansfield,MA
    Posts
    14,160
    Quote Originally Posted by tasslehawf View Post
    The old battery I replaced ran perfectly for 2 years and then it was at 4.89 volts with the bike sitting for a week. It ran fine the week before, but sat for a week over the holidays.

    The new battery sits about 13.5 - 14.1. I noticed the battery seems to slowly drop as the bike idles.

    I noticed these two fault codes related to the battery. The over-voltage one is disturbing:

    41704 : KL30 (Battery positive) under voltage
    Currently present : NO
    Symptom : Signal or value under threshold
    Engine warning light (MIL) : NO
    Frequency count : 1
    Logistic(Healing) count : 39
    Fault Code History : Unknown
    |
    41758 : Battery Positive (KL30) over-voltage
    Currently present : NO
    Symptom : Signal or value over threshold
    Engine warning light (MIL) : NO
    Frequency count : 6
    Logistic(Healing) count : 40
    Fault Code History : Unknown
    Faults with new battery or faults left over from old battery?
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  9. #9
    Registered User tasslehawf's Avatar
    Join Date
    Feb 2016
    Location
    Austin, TX
    Posts
    62
    Quote Originally Posted by Omega Man View Post
    Faults with new battery or faults left over from old battery?
    OM
    I'm not 100% certain. I'm tempted to clear them, but I'm not sure how to force them occurring again without stranding myself again :-(
    2014 Triumph Speed Triple
    2007 F800S
    2006 R1200RT

  10. #10
    I strongly suspect you had a failed (broken) intercell connector - ie battery shot craps - on the old battery. The faults still appear but not related to the new battery. Clear all faults and see, but I suspect the new battery eliminated the problem.
    Last edited by PGlaves; 01-14-2019 at 03:09 PM.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  11. #11
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    Location
    Mansfield,MA
    Posts
    14,160
    Quote Originally Posted by PGlaves View Post
    I strongly suspect you had a failed (broken) intercell connector - ie battery shot craps - on the old battery. The faults still appear but not related to the new battery. Clear all faualts anad see, but I suspect the new battery eliminated the problem.
    Pretty much my thoughts. These complicated bikes with small batteries are easily pushed to the edge.
    Clearing the codes is the way to go. One of those “Anti-Gravity” jump packs is starting to sound like a must have.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

Similar Threads

  1. battery voltage monitor
    By f14rio in forum Gear
    Replies: 3
    Last Post: 04-27-2011, 04:42 AM
  2. battery voltage 2007 R1200RT
    By norvillnh88 in forum Hexheads/Camheads
    Replies: 9
    Last Post: 04-25-2011, 01:16 AM
  3. voltage at battery?
    By brucarb in forum Airheads
    Replies: 6
    Last Post: 07-06-2010, 10:08 PM
  4. 85 k100rs low voltage/charged battery
    By 117336 in forum Flying Brick K-bikes
    Replies: 5
    Last Post: 02-18-2009, 03:39 AM
  5. Low battery voltage when starting?
    By Muneio in forum Oilheads
    Replies: 12
    Last Post: 12-20-2007, 02:14 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •