84 Wagoneer Fuel Gauge / sending unit - JeepForum.com
 
LinkBack Thread Tools
post #1 of 9 Old 03-22-2013, 12:05 PM Thread Starter
Quantumspores
Registered User
 
Join Date: Mar 2013
Location: Morrisville
Posts: 12
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?

Quantumspores is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 03-22-2013, 08:33 PM
1983Chief
Registered User
 
Join Date: Jun 2011
Location: Denton
Posts: 121
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...
1983Chief is offline  
post #3 of 9 Old 03-22-2013, 09:41 PM
RockRollin
Registered User
1990 FSJ Wagoneer 
 
Join Date: Apr 2012
Location: Grand Haven Mi
Posts: 1,325
Is it wired backwards?

"I like fun" Edd
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
"Just Jeepin it real"
RockRollin is offline  
post #4 of 9 Old 03-23-2013, 07:20 AM
timgr
Registered User
1975 CJ6 
 
Join Date: Dec 2012
Location: Medford
Posts: 473
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.

1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D
timgr is offline  
post #5 of 9 Old 03-23-2013, 07:44 AM
RockRollin
Registered User
1990 FSJ Wagoneer 
 
Join Date: Apr 2012
Location: Grand Haven Mi
Posts: 1,325
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.

"I like fun" Edd
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
"Just Jeepin it real"
RockRollin is offline  
post #6 of 9 Old 03-24-2013, 02:57 PM Thread Starter
Quantumspores
Registered User
 
Join Date: Mar 2013
Location: Morrisville
Posts: 12
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.
Quantumspores is offline  
post #7 of 9 Old 03-24-2013, 04:29 PM
RockRollin
Registered User
1990 FSJ Wagoneer 
 
Join Date: Apr 2012
Location: Grand Haven Mi
Posts: 1,325
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

"I like fun" Edd
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
"Just Jeepin it real"
RockRollin is offline  
post #8 of 9 Old 03-27-2013, 10:12 PM
GuyPatterson
Registered User
 
Join Date: Jun 2012
Location: Austin
Posts: 36
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.
GuyPatterson is offline  
post #9 of 9 Old 03-16-2014, 08:09 PM
oldiron4me
Registered User
 
Join Date: Mar 2014
Location: Golden Valley
Posts: 2
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 ?
oldiron4me is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome