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  • 3 Post By illfixit

Thread: Fuel gauge problems
          
   
   

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  1. #1
    illfixit is offline CHR Member Visit my Photo Gallery
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    Unhappy Fuel gauge problems

     



    Working on a hot rod 72 Jeep with the all in one speedometer fuel and temp gauge. It has a new sending unit but the old tank from the po wasn’t hooked up. So this never worked as far as I know since the temp tank. We have 12 v to top right terminal as you look from behind, sending unit wire on top left, flat gnd from temp gauge to fuel, ran volts down the sending unit wire and had 9v at end of wire. Also we tried a separate gnd to the gnd on both sending unit and gauge separately of course and putting 12v to the s/u terminal the gauge goes to full. We’re at a loss at this point.

  2. #2
    DennyW is offline CHR Member Visit my Photo Gallery
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    Example. voltage from the guage goes to the tank sending unit. Then, through the sending unit, back out and to ground. The sending unit controls voltage amount back to the gauge.


    ps: Need to see what you have to help any further.


    PS: Don't forget to refresh the page when you ask a question.
    Last edited by DennyW; 09-06-2018 at 08:03 PM.

  3. #3
    illfixit is offline CHR Member Visit my Photo Gallery
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    Please forgive the ignorance but I can basically test a two terminal battery. Putting the digital tester on the sending unit terminals produces nothing in any combination. Frame gnd to pos, neg, between terminals etc. also check the gauge again and should there be 12.55 v on the top right and bottom terminals, the gnd has 12vs ??? Still nothing on the top left in any combination. Also I don’t remember where the amp light wire was but that’s off now.

  4. #4
    DennyW is offline CHR Member Visit my Photo Gallery
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    Have you looked here for info ?
    Basic Troubleshooting for CJ gauges


    Attachment 70458

  5. #5
    illfixit is offline CHR Member Visit my Photo Gallery
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    I had the wires reversed. Hooked them up like in the diagram and turned the key and wala!!! Works, gauge went to near full which the tank should be. “SO THEN” I went to hook up the amps light and gauge went to E, took wire off and still no movement!! But I think I’m getting closer!!

  6. #6
    illfixit is offline CHR Member Visit my Photo Gallery
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    Think I found the problem!! It was a bad lead from the ignition switch but in deciphering that I now broke a gnd or something, Jeep won’t start and has no power.
    Last edited by illfixit; 09-07-2018 at 04:20 PM.

  7. #7
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    You popped a fuse
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  8. #8
    illfixit is offline CHR Member Visit my Photo Gallery
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    Nope, the melted connector to the batt terminal wasn’t making a connection to the actual terminal just power at the wire, same thing that happened to me when I installed an hei distributor the wire fell off the terminal but was still in the housing. I’m soldering and shrink wrapping the heck out of everything now so once I hav a solid electrical system maybe things will work then. Thanks for the help

  9. #9
    illfixit is offline CHR Member Visit my Photo Gallery
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    Nope, back to no fuel gauge, but a lot of other things that didn’t work now do

  10. #10
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    Well that's progress anyway.
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  11. #11
    illfixit is offline CHR Member Visit my Photo Gallery
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    True very true!! Lol

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