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Update and question.

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

  1. barn63

    barn63 New Member

    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. Mark Mann

    Mark Mann Kermit

    Be sure tank isn't empty! Sorry- Couldn't resist!

    MM
     
  3. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    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. barn63

    barn63 New Member

    Ha Ha. Yeah thats the first thing I checked.
     
  5. sparky

    sparky Sandgroper Staff Member Founder

    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. scott milliner

    scott milliner Master Fabricator

    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. jpflat2a

    jpflat2a what's that noise?

    yes
    or check it with test light
    if voltage is present, it should also pulsate
     
  8. dohc281

    dohc281 It is what it is.

    :iagree:
     
  9. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    You can kill the gauge if you ground the wire more than momentarily. Be careful. The sender always has some resistance.
     
  10. 1960willyscj5

    1960willyscj5 Well-Known Member

    You might run a ground lead from one of the mounting screws to the body and see if that helps.R) :hurrican: :coffee:
     
  11. Mark Mann

    Mark Mann Kermit

    Steel or Poly tank? Seems that I had a grounding problem after switching to a poly tank.. IIRC-
     
  12. barn63

    barn63 New Member