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Does not seem to charge on tickover.

Discussion in 'XJ Technical Chat' started by Jay~Dub, Sep 9, 2010.

  1. Jay~Dub

    Jay~Dub Member

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    My '82 750 Maxim J does not seem to charge on tickover, someone told me this is a design fault and it only charges above 2000 rpm.
    Can anyone confirm this and is there a modification?
    Thanks.
     
    Jay~Dub, Sep 9, 2010
    #1
  2. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Not sure about "tickover" I assume you mean idle. Your idle should be about 1100 RPM. What voltage are you measuring at idle vs voltage at 2000 rpm??
    You should check your alternator brushes and make sure the surfaces they rub on are clean and the brushes are in spec. If they are less than 10mm you'll need to replace.

    Also put what model and year of bike in your signature so we all know what you are working on.

    MN
     
    MN-Maxims, Sep 9, 2010
    #2
  3. mwhite74

    mwhite74 Member

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    Hey Guys,

    Any particular chemical/cleaner that we should use to clean the surface that the alternator brushes rub against? just making sure I don't ruin a bigger part while changing the brushes :D. What a pain getting the screws out of the cover, yikes!

    Marcel
     
    mwhite74, Oct 23, 2011
    #3
  4. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    In answer to your question:

    Confirmed. This is a drawback to the design of the charging/regulating system; it depends on a fully capable battery to carry the workload below about 2000rpm.

    There is no mod that I'm aware of to "correct" this.
     
    bigfitz52, Oct 23, 2011
    #4
  5. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    You'll want to gently clean the comutator (Where the brushes ride) On brush style electric motors we use a com stone to clean while the motor is running. You can't do that on these bikes, but you can use very fine sand paper just to clean the black off. Just be sure you remove all of the residue when you clean it off.
     
    MN-Maxims, Oct 23, 2011
    #5
  6. ldrider82

    ldrider82 New Member

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    Help! Same kind of issue.
    I have a 1982 xj750j, 100,000 miles on it. It's been running great. Just completed an Iron Butt ride around Lake Huron. But now, it just decided to stop charging the battery. I replaced the stator, rectifier, and battery. I snipped off the connector from the stator to the harness and hardwired it too just in case the connector was getting shoddy. Still absolutely no battery charge when the engine is running. Zilch, nothing. The new stator was tested and checks out to be be fine. So what the heck could be preventing the battery from charging?
     
    ldrider82, Oct 25, 2011
    #6
  7. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Worn out alternator brushes (in the cover.)
     
    bigfitz52, Oct 26, 2011
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  8. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Welcome to the site- and Holy Cow !!
    You did an Iron Butt on an XJ - and I'm still working up the nerve to do one on the FJR !! (1,000 miles in 24 HR - verified)

    I tip my helmet in your general direction ! :lol:
     
    TIMEtoRIDE, Oct 26, 2011
    #8

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