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Fuel Gauge Help

Discussion in 'Early CJ5 and CJ6 Tech' started by Johns1967CJ5, Sep 14, 2018.

  1. Johns1967CJ5

    Johns1967CJ5 Sponsor

    So I picked up and NOS cluster because my gauges didn't work now the fuel gauge when the key gets turned on pegs to full I disconnected the Sender unit at the tank and it went back down to empty I grounded the tank make sure everything was grounding well still reads full what am I doing wrong

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    Johns1967CJ5, Sep 14, 2018
    #1
  2. Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    the number one thing with the cluster is it's GOT to be Grounded to dash or separate ground wire to ground
     
    Twin2, Sep 14, 2018
    #2
    heavychevy likes this.
  3. Johns1967CJ5

    Johns1967CJ5 Sponsor

    I ran a ground from cluster to battery. Just checked ohms on the sender and it reads 0.01 but not sure I'm doing it right
     
    Johns1967CJ5, Sep 14, 2018
    #3
  4. Focker

    Focker That's a terrible idea...What time? Staff Member

    Did you look through the Technical Index? I've put a few threads there about gauges and clusters, etc.
     
    Focker, Sep 14, 2018
    #4
  5. Johns1967CJ5

    Johns1967CJ5 Sponsor

    I took the seat off and removed the sending unit. Checked the ohm readings and it seems to work. Put it back in the tank now the gauge seems to be working. Dont ask cuz i dont know :) I'll keep you posted when putting some gas in
     
    Johns1967CJ5, Sep 14, 2018
    #5
    Focker and ojgrsoi like this.
  6. jjdebarros

    jjdebarros Sponsor

    "Problems that go away by themselves, come back by themselves":mad:
     
    jjdebarros, Sep 14, 2018
    #6
    heavychevy likes this.
  7. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Make sure the regulator strap (I think that is what its called) that goes between the fuel gauge and the temp gauge is there and that the temp gauge is also grounding properly to the housing and then to the dash (or with a direct ground wire).
     
    FinoCJ, Sep 14, 2018
    #7
  8. Johns1967CJ5

    Johns1967CJ5 Sponsor

    At least I narrowed it down to the sender.....I think
     
    Johns1967CJ5, Sep 14, 2018
    #8
  9. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    The sender is a very simple component - a variable resistor. The TSM tells you what resistance values give you what indicated levels. I expect it's like the later Jeeps and 73 ohms empty, and 10 ohms full. Get some fixed resistors and test with resistors in place of the sender - one end to the gauge and one end to ground.
     
    timgr, Sep 14, 2018
    #9