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speedometer gauges

Discussion in 'Early CJ5 and CJ6 Tech' started by willow green, Jan 31, 2016.

  1. Jan 31, 2016
    willow green

    willow green Member

    Yakima,Wasington
    Joined:
    Jan 21, 2013
    Messages:
    63
    Hi there everyone, I am looking at purchasing a speedometer for my 1967 CJ5. The seller says that he can't get the needle to move when he hooks up a speedometer cable to the back, It simply won't turn.
    That being said, he also states that he gets 20 OHMS across the gauges, so my question to you all is if the OHMS reading is correct for the gauges, or just the correct reading for the little bar that connects the gauges together. ( I am not well versed in this area as you can tell)
    Vince In Yakima.
     
    willow green, Jan 31, 2016
    #1
  2. Jan 31, 2016
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,128
    Sorry, I may be miss-understanding your question but the speedometer needle moving/not moving has nothing to do with the ohms readings on the fuel & temp gauges- they're completely separate systems.

    The speedo needle not moving is likely caused by dried grease in the mechanism- common issue on old speedos that have been sitting.

    There's not really enough info to comment on the electrical reading, try a search here on "gauges", there's been plenty of information posted in the past about how they work & how to test them.

    H.
     
    Howard Eisenhauer, Jan 31, 2016
    #2
  3. Jan 31, 2016
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    Oct 10, 2015
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    I remember in the old days on my GTO once to test the cable, I disconnected it at the tranny and hooked it up to a drill to get it to spin and see if the gauge turned at a steady speed and for cable noise. I assume you could do that to test.
     
    mickeykelley, Jan 31, 2016
    #3
  4. Jan 31, 2016
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Aug 3, 2003
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    9,841

    Do the odometer numbers turn? If so, Howard may be correct.

    The connecting bar you refer to should have zero ohms, I believe. Be advised, in some CJ5s the speedo assembly incorporates an internal voltage regulator for the gauge display. Improper grounding during "testing" can burn it out. :( Others the regulator is external, attached to the rear.

    A search of the topic in the archives here will be rewarding.
     
    PeteL, Jan 31, 2016
    #4
  5. Feb 1, 2016
    Focker

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

    WA
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    7,540
    Bummer...I searched and I'm finding dead links for old, but great threads on this subject. I'll post things I find that were helpful to me when I went through all the gauges and got EVERY one of them working as intended.

    [​IMG]
     
    Focker, Feb 1, 2016
    #5
    Beach66Bum and chris423 like this.
  6. Feb 1, 2016
    Focker

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

    WA
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    Focker, Feb 1, 2016
    #6
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