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XJ750 83 Circuit cutoff relay

Discussion in 'XJ Technical Chat' started by Frapfrap, Jan 5, 2018.

  1. Frapfrap

    Frapfrap Member

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    Are the circut cutoff relays interchangeable with a standard automotive 4 pin relay or does it need to be the bloody expensive Yamaha part?
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    no

    Relay Assy (12R-01)

    12R-81950-01-00

    you can bypass the relay but it is there for a reason. jump the 2 red/white wires together
     
  3. Frapfrap

    Frapfrap Member

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    Sorry, do you mean no - not interchangeable
    or
    no - I don't need the yamaha relay?
     
  4. k-moe

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

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    You must use the Yamaha relay.
    Let's back up a bit though.
    How do you know that the relay is faulty?

    You really should be asking questions in your build thread so we can do a better job of helping you out without repeating conversations.
     
    Last edited: Jan 11, 2018
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  5. XJ550H

    XJ550H Well-Known Member Premium Member

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    ^^^^ thats the answer
     
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  6. Frapfrap

    Frapfrap Member

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    I'll nip thos conversation in the butt. If the problem persists, I'll see a dr.

    I was changing speedo and shorted a couple of wires. It blew a fuse however it looks like the neutral switch went aswell as now there's no neutral light. Testing the neutral switch shows no response. The relay is activating but I was looking at covering all bases just in case.
    I've ordered a neutral switch and will probably get the relay just as a backup. Cheers.
     
  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    it should work in gear with the clutch pulled in because of the clutch safety switch. if clutch safety switch is bad or removed the bike will only start in neutral so you may have 2 problems
     
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  8. Frapfrap

    Frapfrap Member

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    Yeah, no clutch safety switch, just the neutral light.
     
  9. XJ550H

    XJ550H Well-Known Member Premium Member

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    this is the starter cutoff relay. jumping the 2 red/white wires together bypasses the cutoff relay. #12 is the clutch switch goes to ground through the starter button . tand the diode in the relay goes to the neutral switch #23
    upload_2018-1-12_1-2-1.png

    do not confuse it with the starter relay which is the solinoid
    upload_2018-1-12_1-3-3.png
     
    Last edited: Jan 12, 2018
  10. XJ550H

    XJ550H Well-Known Member Premium Member

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    without the clutch safety switch installed the bike will only start in neutral.
    you can put a jumper wire across the green connector in the headlight bucket then bike will start in gear. you should replace the clutch safety switch.

    so if your neutral switch is bad and with out the clutch safety switch your SCR starter cutoff relay has no ground to make the relay close.
    first temporary fix is the jumper across the clutch safety switch connector as stated above
    second option and which is safer is to ground the wire that connects to the neutral switch this will give the SCR relay a ground to be able to close and allow you to start or operate the starter.

    I would guess your relay is good
    upload_2018-1-12_15-10-19.png
     

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  11. Frapfrap

    Frapfrap Member

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    Yeah, I've bypassed the relay by bridging the red/white for the meantime. Just frustrating as I caused the problem! All good. If anything further happens I'll post in my bike thread. Cheers.
     
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