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Quick question on rewiring oil light

Discussion in 'XJ Technical Chat' started by Mad_Bohemian, Jul 25, 2011.

  1. Mad_Bohemian

    Mad_Bohemian Active Member

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    82 750 Maxim... The stock gauges/computer, and indicators are all gone. I have everything rewired (led for hi beam, neutral, turn indicators and oil, new speedo and tach...).. I just need to wire up my led for the oil light. Looking at the schematic, the oil sensor wire is red/black which I have, but the oil light doesn't come on at all, whne I turn the key on or when cranking the stqarter. After doing some searching I think I understand... the oil light is just a sensor (that the motor has oil...) and is not a pressure sensor. So as long as I have oil in the bike, the light will never come on, correct? I guess I could drain the oil and see if the light comes on when I turn on the key....but I figured it would be easier to ask the gurus here :D Will the oil light ever come on other than when the oil level drops too low??
    TIA
    MB
     
    Mad_Bohemian, Jul 25, 2011
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  2. gitbox

    gitbox Member

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    On my XJ650, the oil light comes on while cranking as a lamp test.
     
    gitbox, Jul 25, 2011
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  3. iandmac

    iandmac Member

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    There is a diode connecting the starting circuit to the oil lamp circuit which allows current to flow back to earth while cranking as a lamp test ...

    http://www.xjbikes.com/Forums/viewtopic/t=32609.html

    If you don't require the test indication, just leave the diode out and everything else should work fine, it does on my 750.
     
    iandmac, Jul 25, 2011
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  4. Polock

    Polock Well-Known Member

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    Mad, i think your right
     
    Polock, Jul 25, 2011
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  5. badfish502

    badfish502 Member

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    Is there anyway to add an actual low pressure sensor to trigger a warning light, or better yet a pressure guage? Id like to see a small oil pressure guage hard mounted to the motor like the harley guys use. Id also like to see a head temp guage like VW guys use... Ideas?

    Jay
     
    badfish502, Jul 26, 2011
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  6. badfish502

    badfish502 Member

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    badfish502, Jul 26, 2011
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  7. badfish502

    badfish502 Member

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    badfish502, Jul 26, 2011
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  8. SQLGuy

    SQLGuy Well-Known Member

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    the problem is where to measure the pressure. There doesn't seem to be any factory-designed place to mount a sensor. If you have an oil cooler, you could add a T to the line running to the cooler, and mount the sensor in the T. If you don't have an oil cooler, I think you'd need to get and install the oil cooler adapter piece that fits behind the oil filter housing, and then run a line from output to input with a T for the sensor.
     
    SQLGuy, Jul 26, 2011
    #8

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