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Possible to hook up a low fuel light? 1982 XJ550 Seca

Discussion in 'XJ Technical Chat' started by Wihburg, Sep 10, 2018.

  1. Wihburg

    Wihburg New Member

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    Hey guys, I changed out the stock guage for smaller aftermarket set. Unfortunately I now do not have a fuel guage. Does anyone know if there is a way to hook up a low fuel light using the stock sending unit?

    Thanks for any input

    Bill
     
    Wihburg, Sep 10, 2018
    #1
  2. Jetfixer

    Jetfixer Well-Known Member

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    Anything is possible, my 84 KZ550 LTD had a low fuel light , a level went down it would start out faint to bright red when empty similar to fuel gauge. Not sure if you could take 2 sending unit wires and run it to a bulb holder you might pull sending unit out and move it up and down to see if light illuminates. You would need to run one wire to a power source hot only when bike powered up and other to ground.
     
    Jetfixer, Sep 10, 2018
    #2
  3. Wihburg

    Wihburg New Member

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    Thanks for the reply. Is there a safety issue with running a power supply to the sending unit?
     
    Wihburg, Sep 10, 2018
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  4. a100man

    a100man Well-Known Member

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    IIRC teh fuel gauge is measuring a resistance, so you need an Ohm meter. not sure though if the variable resistance is even linear wrt the fuel level.. Maybe you can include the sender/resistor in sort sort of transistor bias circuit that can drive a LED as it reaches a critical level.
    I somehow passed a degree in electronics but I'm utterly hopeless at it.
     
    a100man, Sep 11, 2018
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