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Brake Warning Light

Discussion in 'XJ Technical Chat' started by LeClairerog, Apr 24, 2017.

  1. LeClairerog

    LeClairerog 1982 XJ 750 Maxim

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    This is the first of a few posts.

    I have a 1982 XJ750 Maxim. Last year the BATT light would stay on at low rpm's. I found the stator connector under the seat was arcing and replaced it. Blades and terminals were also replaced. Now the battery is on constantly.

    Thanks
     
  2. LeClairerog

    LeClairerog 1982 XJ 750 Maxim

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    I have a 1982 XJ750J Maxim. The brake warning light comes on occasionally. Any ideas where I can start first?

    I rebuilt the MC last year and that looks good.

    Thanks.
     
  3. Craig B

    Craig B Active Member

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    Someone correct me if I am wrong but I thought it was the battery fluid level, that if low, turns the light on.
     
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  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    That is correct, unless the mod has been done to turn it into a batery voltage monitor.

    OP, has that mod been done, or is the battery level sensor still hooked up? The level sensor screws in to one of the battery cell caps, and hooks up to a white wire with a red trace.
     
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  5. LeClairerog

    LeClairerog 1982 XJ 750 Maxim

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    When I received the bike year before last there wasn't anything screwed into any of the cells in the original battery. That doesn't mean it's not there though. I'll take a look and update the thread when I can determine if it might be tucked in the back.
     
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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  7. LeClairerog

    LeClairerog 1982 XJ 750 Maxim

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    Thanks for the information. Much appreciated.

    I have a Yamaha battery but it has push in caps. I have to do some research to see if I can find a battery that will fit that has screw in caps. I want to get this bike working like it did coming out of the factory so this is essential.
     
  8. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The sensors are still available through Yuasa, and can be fitted to the battery you have.
     
  9. Stumplifter

    Stumplifter Well-Known Member

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    Roger, you should keep your electrical questions connected in one thread.
    Cause they very well maybe connected.

    The flashers - pretty sure you need to verify that all 4 have the correct watt bulbs in them (24w?). An imbalance of watts / current draw will make things funny.
     
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  10. XJ550H

    XJ550H Well-Known Member Premium Member

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    add brake fluid?
     
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  11. LeClairerog

    LeClairerog 1982 XJ 750 Maxim

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    Great. I'll check that out first. Much appreciated.
     
  12. LeClairerog

    LeClairerog 1982 XJ 750 Maxim

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    That's good to know. From what I read it's stated that I needed screw in battery caps.
     
  13. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Merged. The second post is from the second thread.
     
  14. BigT

    BigT Active Member

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    I just use an appropriate size tap to thread the hole for the cell cap. Do it before you fill the battery and make sure you get all the plastic bits out of the cell before you fill it.

    I got my battery fluid level sensor from a Yamaha dealer about 6 years ago, before I found this site and Xj4ever.
     
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  15. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    You can also press the button to reset everything each time you start up......
     
  16. robbo

    robbo Member

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    sorry to jump on this thread,i have fitted a 2.2k ohms 1 watt resistor and the warning light remains on.battery reads 12.55v and at 2k revs 14.25v
     
  17. TheCrazyGnat

    TheCrazyGnat Well-Known Member

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    I used 2 2.2k ohm 1/4 watt resistors on mine. Which wire did you run it into?
     
  18. XJ550H

    XJ550H Well-Known Member Premium Member

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    you are at the 10% over value mentioned 2K ohms in the thread. read voltages on both sides of the resistor what do you get?
     
  19. XJ550H

    XJ550H Well-Known Member Premium Member

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    did it work?
    did you run them in series or parallel?
    parallel would make it 1.1k ohms 1/2 watt
    series would make it 4.4k ohms still 1/4 watt.


    82 xj750 wiring diagram shows it as a white /red wire that runs up to ignition switch and then to computer.

    the other end of resistor would go to the + battery terminal
    then check the voltage drop on the resistor white/red wire
     
    Last edited: Apr 28, 2017
  20. XJ550H

    XJ550H Well-Known Member Premium Member

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    from xj4ever catalog
    What about my original battery fluid level sensor?
    :

    Also, the sensor reads voltage, and without enough voltage to trigger the computer system, the light illuminates. The wire path from the sensor goes through your ignition switch and if this switch has electrically "dirty" internal contacts, then that can add enough resistance to cut the voltage signal enough to trigger the dash "low Batt" warning light or display, even though the sensor is fine and the fluid level is okay! So: remove the ignition switch, and its bottom plate, and clean the copper contacts inside the ignition switch.

    this is what you need to
    http://www.xj4ever.com/HCP14180 battery sensor bypass.pdfread
     

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