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xj750rk battery sensor

Discussion in 'XJ Technical Chat' started by Gearhead76, Feb 11, 2007.

  1. Gearhead76

    Gearhead76 Member

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    Hi just got this bike Friday, was repoed by the city, guy didn't care because he said it doesn't run and couldn't be fixed, so I got it for $300 with a clean title. all that was wrong with it was the fuse box was melted and wasn't making good contact with the fuses, I fixed that with some water proof spade fuse holders. Started right up and runs great,

    The only problem I have is there is no battery sensor and that warning light will drive you nuts. I just stuck the wire for it into a connector with a power wire for the tail lights, only has power with the ignition on.

    Just curious if this would hurt anything or not it did get the light off.

    All it's there for is to tell the computer if there's voltage or not right?

    Thanks for the help guys.
     
  2. KiwiXJ750D

    KiwiXJ750D Member

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    I've heard that you can just connect the sensor to the positive terminal of the battery.

    The manual (Haynes) says: On machines equipped with a computer the sensor must be fitted to the 4th cell from the (-) terminal, failure to do this may lead to damage of the microprocessor.

    It also shows if the level in the cell is low.
     
  3. WeAreZilla

    WeAreZilla Member

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  4. Gearhead76

    Gearhead76 Member

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    Thanks very informative, I'll do the resistors 4.4k 1.2watt

    Thanks for all the help

    computers, this is the newest bike I've owned, all others were late 70's

    but you guys have a great bunch of knowlegable people and like to help and that's awsome
     
  5. Gearhead76

    Gearhead76 Member

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    I put a 3.3k ohm 1/2 watt resistor in and it didn't make a difference on voltage. so I put a 470k ohm 1/2 watt resistor in and that only dropped it down 1/2 a volt, am I doing something wrong, I just stuck the resistor in a 12v plug in and tested voltage at the other end of the resistor,

    any help would be great
    thanks
    Gearhead76
     
  6. MiCarl

    MiCarl Active Member

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    To measure the voltage drop across a resistor it needs to be in a functioning circuit. You won't measure any drop across a resistor when there is no current flowing. The voltage drop you are measuring at the unconnected end of the resistor is due to the small current your meter draws.
     
  7. Gearhead76

    Gearhead76 Member

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    right you are, I put the 3.3k ohm 1/2 watt resistor in conected the wires and had 2.1volts, which should be fine for the computer and the battery light goes off after startup. Look at that I learned something today.

    Thanks for all the help
     

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