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Username Post: Fuel gauge not working        (Topic#372476)
Posts: 10

Reg: 01-22-23
01-26-23 03:39 PM - Post#2853789    

Regarding the 2 fuel gauge tabs on the fuse panel. The top tab has no power. The bottom tab has power. Shouldn't the top tab also have power with the ignition switch on?

The wires going into the ignition switch all have power.
All fuses checked and have power on every one.

Is the no power on the top tab problem in the fuse panel connection inside?

I'm trying to figure out why my fuel gauge doesn't work (it did before switching the printed circuit cluster).

In the diagrams, I see that the fuel gauge wire is connected to the top tab.


Super Senior Member
Posts: 6599

Loc: paradise
Reg: 09-05-03
01-29-23 01:10 PM - Post#2853882    
    In response to data89

welcome to ct. without pics its hard to say. if the top tab should have power you need to find out why it dosent.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.

Posts: 10

Reg: 01-22-23
02-01-23 08:44 AM - Post#2853997    
    In response to bobb

I checked voltage and resistance. It appears that the tan wire from the tank goes behind and inside the fusebox to the top tab. Resistance on the wire disconnected is approximately 1.2K ohms (I'm assuming that's the resistance of the wire).
With that wire at the tab and from the tank disconnected I have 12V ign on.
From the tab to ground, ign on or off, I have 0V.

Conclusion now is that I have to pull the instrument panel off (under the dash the only 2 wires that are tan are the radio and the dome light) and follow the wires from the cluster plug.
data89 is online now Report Post Edit/Delete Message

Valued Contributor
Posts: 3934

Loc: Eagan MN
Reg: 06-02-03
02-02-23 05:13 PM - Post#2854070    
    In response to data89

Your post did not state what your vehicle is so assume it's a 67-72 truck. After reading what's been done - would suspect the ribbon connector on the back of the instrument cluster. Unplug it (might have to remove the cluster from the dash) and clean the contacts on the mylar ribbon using some rubbing alcohol. Re insert the ribbon into the cluster connector.

I had my amp (battery) gauge act flaky and doing this fixed it.

Proud owner of My Blue 62 Impala SS

Posts: 10

Reg: 01-22-23
03-21-23 05:58 PM - Post#2856007    
    In response to doubleE

Ribbon cluster circuit is brand new. Waiting for warmer weather now to work in the garage (40F).

Posts: 10

Reg: 01-22-23
06-12-23 08:07 AM - Post#2859106    
    In response to data89

  • data89 Said:
Ribbon cluster circuit is brand new. Waiting for warmer weather now to work in the garage (40F).

In case anyone wants to know the end of the story...during the troubleshooting process the 3 amp fuse had blown, and 2nd the sending unit wire was not connected to the fuel tab on the fuse box. All fixed now.

Site Ambassador -"20th Year" Gold Supporting Member
Posts: 3939
Age: 72
Reg: 11-24-02
06-12-23 09:43 AM - Post#2859116    
    In response to data89

Thanks for the update,always appreciated!

'67 Camaro survivor
'06 Z71 Sierra Ex Cab
'37 Chevy cp.SOLD!!6/7/14
'73 Nova pro-street project
'17 Chevy Trax LT


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