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Fuel Gauge Help

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Johns1967CJ5, Sep 14, 2018 at 8:59 AM.

  1. Sep 14, 2018 at 8:59 AM
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

    Northern NJ
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    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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  2. Sep 14, 2018 at 9:09 AM
    Twin2

    Twin2 wasn't me Sponsor

    Virginia Beach, VA
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    the number one thing with the cluster is it's GOT to be Grounded to dash or separate ground wire to ground
     
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  3. Sep 14, 2018 at 9:13 AM
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

    Northern NJ
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    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
     
  4. Sep 14, 2018 at 11:18 AM
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

    Tri-Cities WA
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    Did you look through the Technical Index? I've put a few threads there about gauges and clusters, etc.
     
  5. Sep 14, 2018 at 12:22 PM
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

    Northern NJ
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    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
     
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  6. Sep 14, 2018 at 12:48 PM
    jjdebarros

    jjdebarros Sponsor Sponsor

    Spokane, WA
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    "Problems that go away by themselves, come back by themselves":mad:
     
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  7. Sep 14, 2018 at 1:18 PM
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    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).
     
  8. Sep 14, 2018 at 1:45 PM
    Johns1967CJ5

    Johns1967CJ5 Sponsor Sponsor

    Northern NJ
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    At least I narrowed it down to the sender.....I think
     
  9. Sep 14, 2018 at 1:58 PM
    timgr

    timgr Jeepin' Nerd Sponsor

    Medford Mass USA
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    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.
     

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