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Update and question.

Discussion in 'Early CJ5 and CJ6 Tech' started by barn63, May 7, 2007.

  1. May 7, 2007
    barn63

    barn63 New Member

    Macomb, IL
    Joined:
    Apr 18, 2007
    Messages:
    24
    Well I finished wiring up my jeep and everything works....except the guage cluster. The speedo works....but the cable doesn't spin. Not to bad to fix...However, my gas guage doesn't read anything. How can I test whether the guage, the sending unit, or both isn't working properly?

    BTW EZ wirng kit is worth every penny. I started out super discouraged but after digging in....its all realy simple.
     
  2. May 7, 2007
    Mark Mann

    Mark Mann Kermit

    Huntsville, AL
    Joined:
    Jan 8, 2003
    Messages:
    140
    Be sure tank isn't empty! Sorry- Couldn't resist!

    MM
     
  3. May 7, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    23,596
    The tank sending unit is a rheostat (variable resistor). There's a spec for what the resistance should be at each level. You can test the gauge by substituting fixed resistors or a potentiometer for the sender. Make sure the sending unit is well grounded.
     
  4. May 7, 2007
    barn63

    barn63 New Member

    Macomb, IL
    Joined:
    Apr 18, 2007
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    Ha Ha. Yeah thats the first thing I checked.
     
  5. May 7, 2007
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Check the forum, I know it's documented what the readings empty and full are, get a multimeter out and measure the Ohms from the sending unit. Chances are it's the gage.
     
  6. May 7, 2007
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
    Dec 17, 2002
    Messages:
    2,362
    That's way to big of words for me. R)

    Wouldn't it be easier to say: Take wire off sending unit. Ground wire. Fuel gauge should read Full. ;)
     
  7. May 7, 2007
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    yes
    or check it with test light
    if voltage is present, it should also pulsate
     
  8. May 7, 2007
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
    Messages:
    605
    :iagree:
     
  9. May 7, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    You can kill the gauge if you ground the wire more than momentarily. Be careful. The sender always has some resistance.
     
  10. May 7, 2007
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
    Joined:
    Nov 27, 2006
    Messages:
    2,793
    You might run a ground lead from one of the mounting screws to the body and see if that helps.R) :hurrican: :coffee:
     
  11. May 13, 2007
    Mark Mann

    Mark Mann Kermit

    Huntsville, AL
    Joined:
    Jan 8, 2003
    Messages:
    140
    Steel or Poly tank? Seems that I had a grounding problem after switching to a poly tank.. IIRC-
     
  12. May 14, 2007
    barn63

    barn63 New Member

    Macomb, IL
    Joined:
    Apr 18, 2007
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