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Temperature Gauge Issue

Discussion in 'Early CJ5 and CJ6 Tech' started by LKap, Jun 12, 2022.

  1. Jun 12, 2022
    LKap

    LKap New Member

    Phoenix, Arizona
    Joined:
    Aug 18, 2021
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    Finishing up a complete restoration of my ‘59. I just installed a new fuel and temp gauge in my ‘59. Both sending units are new as well. When I took it apart a year ago neither worked. The new gauges are Omix ordered from KW. The fuel gauge works fine. With the ignition off the temp gauge needle is just to the right of the “C”. When I turn the ignition on the needle pins to the left even further past the “C”. I have taken it apart 3 different times and made sure there was no contact with the post and the housing. Does the same thing with the sending unit wire off. Wiring harness is brand new from Walcks. Everything else works perfectly. What did I do wrong? Bad gauge? bad sending unit?
     
  2. Jun 12, 2022
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Nov 22, 2003
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    Got an meter? With the lead disconnected from the temp sender read the resistance on the wire terminal to ground- , should be somewheres notrth of 20 ohms, if zero then you have a short in the wire someplace.
     
  3. Jun 12, 2022
    LKap

    LKap New Member

    Phoenix, Arizona
    Joined:
    Aug 18, 2021
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    With ignition off, resistance at the sender terminal of the gauge to ground is around 23 ohms. It just doesn’t make sense that the needle goes the wrong way with ignition on. If there were a short would it go all the way to “H”? It’s doing just the opposite
     
  4. Jun 12, 2022
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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  5. Jun 13, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    82CJtempwiring (485 x 600).jpg


    This is from the '82 TSM, but it's the same as what your '59 has re this issue. You can see that the CVR ("constant" voltage regulator) is inside the fuel gauge. The connection A to S sends that regulated voltage to the temperature gauge via the connecting strap on the back of the gauges. It's made so you can't reverse the polarity when assembled. However, the temperature gauge has no internal ground. You can reverse polarity if you take the strap loose and connect the gauge backwards using a clip lead or such, ie A to A and S to the sending unit.

    If you reverse the polarity and it works, then the part is defective and you can exchange it, or run with it wired backwards.

    Is this a 6V system? If so, you may not have the CVR. The connections will be the same. Backwards polarity will make the needle deflect backwards.
     
    Last edited: Jun 13, 2022
  6. Jun 13, 2022
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
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    3,625
    I think the problem is the brand; Omix. Consider yourself lucky that the fuel gauge works. Out of 7 - 8 Omix gauges/senders I have worked with in the past 5 years, none have worked properly, if at all.
    I try to find good used or NOS parts.
    -Donny
     
  7. Jun 13, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    Still have the old parts? If I did, I would put the old part in and see if it works.
     
  8. Jun 13, 2022
    LKap

    LKap New Member

    Phoenix, Arizona
    Joined:
    Aug 18, 2021
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    Resolved! Thanks for your input. Yep, Omix does it again. Took the strap off and hooked the jumper to the “S” terminal and connected the wire from the sending unit to the “A” terminal. Works!
     
  9. Jun 13, 2022
    maurywhurt

    maurywhurt Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Western North...
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    To Donny's point....just in case you're interested, here's a link to an NOS speedometer assembly on eBay. I bought mine from this same seller years ago. Unfortunately, these NOS speedos do not go cheaply.

    This one would need to have the bezel repainted (shelf wear), but it looks good otherwise. If you get one like this, you would also want to clean out all the original grease and re-lube it with new white silicone grease.

    https://www.ebay.com/itm/304475101554?fits=Make:Jeep&hash=item46e4215972:g:mXQAAOSw88Vds4Vv
     
  10. Jun 13, 2022
    LKap

    LKap New Member

    Phoenix, Arizona
    Joined:
    Aug 18, 2021
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    Wow! That’s pricey. I have my original but unfortunately the speedo gear is seized. I had an extra aftermarket one that I’m using just to get on the road. Someday I’ll get to rebuilding the old one.
     
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