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1983 XJ900 Lights & Indicators On Together

Discussion in 'XJ Technical Chat' started by DavidF, Mar 20, 2019.

  1. DavidF

    DavidF Member

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    OK so finishing my XJ rebuild and have an annoying problem.
    When I turn headlights on (PO or ON), both front turn signals also illuminate. The rear turn signals do not come on, but otherwise work fine ie flash when they should.
    When I operate the turn signal switch, even with the lights on, everything works as it should !
    I’ve checked the earth/ground, I’ve run a separate earth/ground from battery to 9-pin headlight block and I’ve checked the flasher relay. All to no avail.
    I’ve looked at a wiring diagram but can’t see any point where there could be an interface.
    Has anyone come across this before ?
    Cheers
     
  2. Ryengoth

    Ryengoth Active Member

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    It could be the diode pack in the headlight bucket or the cancellor under the seat. Not sure but they both affect the signal power.
     
  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    pull your cancelling unit. it is the only mystery connections in the system
     
  4. DavidF

    DavidF Member

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    Thanks to Ryengoth & XJ550......I’ll report back tomorrow
     
  5. k-moe

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

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    If I'm remembering correctly the 900 has the front turn signals wired to be marker lamps.
    If I'm not right, that is a fairly common modification.

    I'm assuming that you mean the front signals are flashing along with the rears, but are steady-on otherwise.
     
  6. DavidF

    DavidF Member

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    Hi K-moe
    To clarify, if the headlights are OFF, none of the indicators are on and front & rear work correctly.
    If the headlight is ON, so are the front left & right indicators (the rear are not on). If the indicators are operated in this mode, they work correctly.
    So, your suggestion that the front indicators are marker lamps could be true......except that would be illegal here in the UK and it wouldn’t pass the statutory MOT examination. So a wiring mod may be required.
    I’m gonna check other components as per upthread before messing with wires !!
    Cheers
     
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  7. bensalf

    bensalf Well-Known Member

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    ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
    ......except that would be illegal here in the UK and it wouldn’t pass the statutory MOT examination. So a wiring mod may be required.
    --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    don't think that is true anymore, a friend has just bought a brand new honda cross runner, and his indicators are wired that way. Headlight and daytime running lights are on permanently (no switch) front indicators are on "steady" then flash when operated, you're good to go.
    stu
     
  8. DavidF

    DavidF Member

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    Thanks Stu, that’s interesting !
    Anyway, the upshot is that I’ve sorted it !
    In the headlight bucket is a large black Kioto block (mine has 25P stamped on it) with a 4-pin connector. I unplugged it and all seems to work as I wish.
    Thus it is an easy job to convert back if required.
    I appreciate members input in providing suggestions.
     
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  9. k-moe

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

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    That's the diode block. It is a component of other circuits, not just the signals.
    You will need a replacement.
     
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  10. DavidF

    DavidF Member

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    I understand what you’re saying k-moe but everything is working fine !?
    What does this diode block do exactly ?
     
  11. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Coordinates/controls the action of all the various safety switches and relays in the electrical system.
     
  12. DavidF

    DavidF Member

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    Thank you. I think the shakedown run will demonstrate any anomalies !!
     
  13. k-moe

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

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    Hopefully without becoming stranded alongside the road.
     
  14. DavidF

    DavidF Member

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    I’ll have it in my pocket
     
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  15. XJ550H

    XJ550H Well-Known Member Premium Member

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    and a screw driver.

    my wiring diagram shows your diode block as being used only for the oil light test and oil level. blinkers should not be affected.
     
    Last edited: Mar 22, 2019
  16. k-moe

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

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    In which case there is probably a bare wire somewhere in the harness, or a "clever" PO rewiring.

    IMO this is worth investigating and fixing correctly. It's a sign of potential trouble lurking beneath.
     
  17. DavidF

    DavidF Member

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    Hi XJ550H
    Is it possible to scan & post that wiring diagram as I’ve not been able to find the correct one on the Net.
    To be sure, my diode Block is in the headlamp bucket and has 4 wires : Black, Brown, Light Blue and Light Blue/White.
    The oil lamp appears to work fine !
    You do realise this is the 83 XJ750E-II.....although in essence a 750 motor in a 900 frame, there are elements that make it a mule and neither manual (750 or 900) indicates what is actually on my bike !!!
     
  18. k-moe

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

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    Since you're working on your E-II you should have put that in the thread title.
    We've all been working on the assumption that you were working on an XJ900.
    I think @hogfiddles has a XJ750-EII service manual, but it's not in English.
     
  19. DavidF

    DavidF Member

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    Sorry everyone, you’re dead right, it would help ?
    I’d love a copy of a service manual, Google is great at translating most.....no doubt Japanese ?!
     
  20. XJ550H

    XJ550H Well-Known Member Premium Member

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    I only have xj900 manuals .

    this is the diode block I have in diagrams
    900 diode.PNG
    l/w goes to starter button
    B/r goes to oil light and the second B/r wire goes to the solenoid.
    this configuration is for oil light and test circuit

    these 2 diode blocks are from 650G and 650H as you can see there are more diodes and more
    test/function circuits. head light and sidestand shift
    650H diode.PNG 650G diode.PNG
     

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