Battery Voltage

Discussion in 'GS Boxers' started by Joeboxer82is, Jul 9, 2013.

  1. Joeboxer82is

    Joeboxer82is Adventurer

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    I was riding to work earlier when i noticed my voltage went down to 11.7 from 13.4 and e battery light lit up. I had e battery and starter replaced in May. Could it be either e coil or rectifier??

    [​IMG]
    #1
  2. mouthfulloflake

    mouthfulloflake Not afraid

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    I think all of the coil and rectifier are internal to your Bosch type alternator.

    likely an easy repair for you, or a local automobile electronics ( starter/alternator type ) shop.

    or try here.

    http://www.euromotoelectrics.com/category-s/26.htm

    I find the site a bit tough to navigate, but the parts are good and priced fair.
    #2
  3. JimVonBaden

    JimVonBaden "Cool" Aid!

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    Assuming you have no loose cables, it would likely be your alternator. Easy, if not cheap, fix. (OK, not that easy.)

    Jim :brow
    #3
  4. Jazz62

    Jazz62 Long timer

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    Can a loose alternator belt cause this?
    #4
  5. JimVonBaden

    JimVonBaden "Cool" Aid!

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    It could, though usually you will hear it.

    Jim :brow
    #5
  6. Joeboxer82is

    Joeboxer82is Adventurer

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    There's no weird or strange sound coming from e alternator. Hopefully it's just some loose wires... I'll be getting it checked later.Mine is a 2001 R1150GS with 222,000km in it. Thanks fellas...
    #6
  7. GS Addict

    GS Addict Pepperfool

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    If it's not the belt, at that mileage I would suspect the brushes.
    #7
  8. Joeboxer82is

    Joeboxer82is Adventurer

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    The mechanic told me that the alternator has to be replaced.Lucky he has a used one... Not cheap though! Btw how much does a brand new alternator cost? I do understand that it's a bitch to take it off from e bike.
    #8
  9. Twilight Error

    Twilight Error Going nowhere slowly

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    Do you have any accessory loads running off the voltage lead in the diagnostic plug?

    A couple months ago, I had an intermittent voltage drop and battery light flicker problem. I *thought* it was the alternator, but it turns out I had a bad relay coil connected to that voltage lead. When I replaced the relay, the problem resolved itself.
    Along the way, I replaced the voltage regulator - if you've got the alternator out now, remove the VR and have a look at the brushes/shaft. My brushes were significantly worn, so I put a new one in on the 'it can't hurt' principle.
    #9
  10. def

    def Ginger th wonder dog

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    I would remove the front cover and inspect the alternator belt.
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  11. GS Addict

    GS Addict Pepperfool

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    Used oilhead alternators are reasonably inexpensive and I have never gotten much for any that I have sold in the past.
    Yes they are tedious to remove if the bike has ABS. I have done them.
    The unit IS repairable - parts are available from Euromotoelectrics.
    Link to a reman one. http://www.euromotoelectrics.com/Reman-Alternator-K-Oilhead-BMW-ALT020R-p/bmw-alt1020r.htm
    #11
  12. def

    def Ginger th wonder dog

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    Alternators have few wear parts. They are

    1- Brush(es).
    2- Bearings.

    The other part that might require replacement would be the regulator/rectifier. It is very unlikely that the stator windings have failed.

    First things first...there is a chance that the drive belt has broken. It is easy to check so, I would go there first.

    We're curious so, keep us informed of what you find.

    Thank you.
    #12
  13. def

    def Ginger th wonder dog

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    "Caution Will Smith...beware of suspicious used alternator salesmen"

    "Hey Andy" "Hey Barney. How ya doin"?

    "Well Andy, I've got a problem with that car I just bought from that nice little old lady over in Mount Pilot. The battery isn't chargin' like it should" "Well Barn, I would take it over to Guber and have him check the alternator".

    "Andy, that car is a 6 volt electrical system and its a generator, not an alternator. Alternators haven't been used on cars yet. Andy, you should know that".

    "Well Barney, I was just tryin' to help. Do what you want".
    #13
  14. GS/BS

    GS/BS Adventurer

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    Wow- That's interesting as I was on a business trip yesterday out in the middle of nowhere and my Battery light came on. I had to meet with a client so was concerned. The bike did start after my 30 min appointment but only 1 ABS light is flashing and my Tachometer quit working. During my return trip, the light went out and the Tach started again for about a minute and then the light was back on Tach off again. I got it home but have not had time to look into it much. Did check battery connections all are good. The battery came up on the trickle charger but still have the same issues. I'm thinking Loose Wire. Going to dive into it tonight. Will take any info from anybody. Thanks.
    #14
  15. def

    def Ginger th wonder dog

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    "Hey Andy" "Hey Barney" "Andy, Guber had a look at the wires under the hood. He says, Can't be fixed. Whadda I do now Andy"?

    "Well Barn, I'd put an alternator on it".
    #15
  16. JimVonBaden

    JimVonBaden "Cool" Aid!

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    Don't underestimate the power (lack) of a bad battery! Internal shorting can cause this too.

    Jim :brow
    #16
  17. Joeboxer82is

    Joeboxer82is Adventurer

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    Thanks for all e help fellas. I'm not mechanically inclined to "operate" e bike so for now i'll leave it to e mechanic BUT i'll have e old alternator back and get someone (who knows it) to inspect further n maybe if it's reusable like what most of u have mentioned,i'll just replace what is needed and keep it as a spare. This is my 1st R1150GS and there's a lot i gotta learn. Ain't nothing like e Japanese bikes that i know of. Sold my Tiger800 for this 11 years old baby and never once regret it :)
    #17
  18. GS/BS

    GS/BS Adventurer

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    Well Guys, looks like I got off easy, the #1 fuse was badly distorted and almost burnt. Replaced and all seems well. Thanks for your info.
    #18
  19. Joeboxer82is

    Joeboxer82is Adventurer

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    Damn i think i should get that checked...
    #19
  20. GS Addict

    GS Addict Pepperfool

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    You forgot slip rings
    #20