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Unread 03-22-2013, 12:05 PM   #1
Quantumspores
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84 Wagoneer Fuel Gauge / sending unit

Hi Folks,

So i've got a fuel gauge problem that is driving me slightly insane. I have a 1984 Grand Wagoneer limited where the fuel gauge is always showing empty. I replaced the sending unit but still the guage shows empty. The sending has two attachments, one for a red wire, the other a black wire. When I added a second ground wire from the black connector to the frame nothing changes. When I place that second ground wire from the red-wire connection point to the frame the gauge spikes to full and stays there. Thus it seems the gauge is functional.

Any suggestions?

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Unread 03-22-2013, 08:33 PM   #2
1983Chief
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It sounds like your signal wire is the problem. Try tracing it down and see if its broken or corroded anywhere. Or you could just run a new one...
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Unread 03-22-2013, 09:41 PM   #3
RockRollin
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Is it wired backwards?
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Unread 03-23-2013, 07:20 AM   #4
timgr
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http://www.jeepforum.com/forum/f57/f...gauge-1495777/

Have you read the '84 TSM about fuel guage diagnosis? The TSM typically has a very helpful flow chart that tells you how to diagnose gauge problems.
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Unread 03-23-2013, 07:44 AM   #5
RockRollin
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Quote:
Originally Posted by timgr View Post
http://www.jeepforum.com/forum/f57/f...gauge-1495777/

Have you read the '84 TSM about fuel guage diagnosis? The TSM typically has a very helpful flow chart that tells you how to diagnose gauge problems.
I just went to link the same topic, check last post.
That is what I was referring to the reversal of the ohm resistance in the 85 to 86 model year to mark full.
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Unread 03-24-2013, 02:57 PM   #6
Quantumspores
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No, the polarity is not reversed, I checked.
I confirmed the ground is good by running a ground directly to the battery as a test, no change.
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Unread 03-24-2013, 04:29 PM   #7
RockRollin
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Quote:
Originally Posted by Quantumspores View Post
No, the polarity is not reversed, I checked.
I confirmed the ground is good by running a ground directly to the battery as a test, no change.
I was incorrect in saying polarity, it is an opposite signal from the 85to86 year model.
You can check the signal at the guage, or the sending unit as timgr suggested.
63-85. 73 empty, 10 full
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Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-27-2013, 10:12 PM   #8
GuyPatterson
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test the continuity from the sending unit to the gauge; this should tell you whether you have a break in the wire. I used some spare wire to extend reach of my multimeter and tested the continuity. If a good signal is getting to the gauge, your gauge is likely busted.
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Unread 03-16-2014, 08:09 PM   #9
oldiron4me
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Ok..try this and feel free to comment..help appreciated. I restored my 85 J20. Pulled tank and washed it out and cleaned Everything..painted Everything correctly. Ground is good and even added new extra ground to cleaned bare frame location. Wire to gauge is all new, ground wire new.
At half tank gauge reads full PLUS. All other gauges working correctly. Dash cluster grounded well with an additional ground wire added just to be sure. New gauge and sending unit from Team Grand Wagoneer, and all installed correctly, new tank vent and all vent lines and fuel lines new. Everything but tank and skid-plate/straps are new. I even cleaned and inspected the dash backing when it was out/apart and cleaned the 'racetrack' ground and all connections and harness. New fuses, New battery, new alternator, new engine harness..all running fine. When I first fired it up to run the cam break-in on new engine..it read half tank and as I started with a clean empty tank, I knew it was exactly a half tank I put in. Then it went to full+ and stayed there when key is on or truck running. ...Anyone ?
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