Gas Gauge Voltage? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Stingray42 · 11-01-2004, 07:23 PM

My gas guage is currently not working.... I am goin to pull the dash apart tonight, and need to know what kinda voltage the termanils should be reading at full and empty, does anyone know what they should be or where I would find em?

Thanks

NeCrOmAnCeR · 11-01-2004, 09:05 PM

The guage itself recieves 12 volts and a ground, the sensing wire would have nearly 0 volts while the tank is empty, and almost 12 volts when the tank is full. All this assumes the guage is still in the circuit when you are making the measurements. The guage itself works on current flow through the sending unit, not specifically voltage. Have you tried grounding the sending unit wire with the ignition turned on? With the wire grounded the guage should read ampty and with it disconnected, it should peg. Good luck.

Stingray42 · 11-01-2004, 09:09 PM

awesome, thanks.

now...what terminals are what?

Stingray42 · 11-01-2004, 11:56 PM

ok... figured out the terminals and everything , did the grounding wire thing... now what? It pegs and goes to empty, but stays pegged when you take the wire off and start the truck. Whats next? Oh, and the guage goes past full and empty on each side when you do it....

???
Thanks

NeCrOmAnCeR · 11-02-2004, 10:01 AM

Sounds like the guage itself is working fine. Check the sending unit(s) for the correct resistance (90 Ohm full, 0 Ohm empty) Also check to make sure the fuel tank ground is connected and clean. Does your truck have dual tanks? If so, also check the connections on the selector valve.

Stingray42 · 11-02-2004, 11:56 PM

had dual tanks, they were gone before i got the truck, and i tore the selector out, but it stopped working before that....

do i have to pull the tank to check the resistance on the sending unit?
someone help! lol right now I need a jerry can in the box for when I run out... lol

11-01-2004, 07:23 PM	#1
Stingray42 Woot. Join Date: Jan 2003 Location: Stouffville, Ontario Posts: 2,291	Gas Gauge Voltage? My gas guage is currently not working.... I am goin to pull the dash apart tonight, and need to know what kinda voltage the termanils should be reading at full and empty, does anyone know what they should be or where I would find em? Thanks __________________ Clarkson 96 Chevy RCLB 4.3 2WD

11-01-2004, 09:09 PM	#3
Stingray42 Woot. Join Date: Jan 2003 Location: Stouffville, Ontario Posts: 2,291	awesome, thanks. now...what terminals are what? __________________ Clarkson 96 Chevy RCLB 4.3 2WD

11-01-2004, 11:56 PM	#4
Stingray42 Woot. Join Date: Jan 2003 Location: Stouffville, Ontario Posts: 2,291	ok... figured out the terminals and everything , did the grounding wire thing... now what? It pegs and goes to empty, but stays pegged when you take the wire off and start the truck. Whats next? Oh, and the guage goes past full and empty on each side when you do it.... ??? Thanks __________________ Clarkson 96 Chevy RCLB 4.3 2WD

11-02-2004, 11:56 PM	#6
Stingray42 Woot. Join Date: Jan 2003 Location: Stouffville, Ontario Posts: 2,291	had dual tanks, they were gone before i got the truck, and i tore the selector out, but it stopped working before that.... do i have to pull the tank to check the resistance on the sending unit? someone help! lol right now I need a jerry can in the box for when I run out... lol __________________ Clarkson 96 Chevy RCLB 4.3 2WD Last edited by Stingray42; 11-03-2004 at 01:29 PM.

11-01-2004, 09:05 PM	#2
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	The guage itself recieves 12 volts and a ground, the sensing wire would have nearly 0 volts while the tank is empty, and almost 12 volts when the tank is full. All this assumes the guage is still in the circuit when you are making the measurements. The guage itself works on current flow through the sending unit, not specifically voltage. Have you tried grounding the sending unit wire with the ignition turned on? With the wire grounded the guage should read ampty and with it disconnected, it should peg. Good luck.

11-02-2004, 10:01 AM	#5
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	Sounds like the guage itself is working fine. Check the sending unit(s) for the correct resistance (90 Ohm full, 0 Ohm empty) Also check to make sure the fuel tank ground is connected and clean. Does your truck have dual tanks? If so, also check the connections on the selector valve.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.