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Bad Temp Sender?

Discussion in 'Early CJ5 and CJ6 Tech' started by TonyM, Jan 26, 2019.

  1. Jan 26, 2019
    TonyM

    TonyM Member 2023 Sponsor 2022 Sponsor

    Middle Tennessee
    Joined:
    Jul 30, 2017
    Messages:
    170
    1956 CJ5, F134, 6v electrical system. Original instrument cluster (or an old OEM replacement)... Temp gauge stays below C no matter how warm the engine is. Thinking it's a bad/dirty ground, but if I connect a jumper from the temp sender on the block to ground (- batt terminal for instance) the gauge moves to above the H and stays there. No in-between readings as engine warms or cools. Sounds like a bad sender, right?

    Fuel gauge works as it should. Oil and amp lights work as does the speedo itself. No illumination in cluster, but I haven't pulled/replaced the bulbs yet.
     
    TonyM, Jan 26, 2019
    #1
  2. Jan 26, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
    Joined:
    Mar 29, 2007
    Messages:
    5,923
    Grounding the sender wire and getting full hot deflection is normal test. You have a bad sender.
     
    Walt Couch, Jan 26, 2019
    #2
    Rick Whitson and ojgrsoi like this.
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