fuel gauge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tpjb57 · 12-01-2003, 05:05 PM

after replacing my sending unit and double checking the grounds I think my gauge is bad. Is there any sure fire way to check it before I tear it out? I am getting a small amount of current at the sending unit pink wire and the ground is good. Any ideas?
Tom

rfmaster · 12-01-2003, 05:57 PM

I have a 1975 Fuel gauge out of my truck. I'll measure coil resistance with a DVM and let you know. Removing fuel gauge is not too difficult of a job

. Also, the soft PCB circuit, which is used as a backplane for your instrument cluster may have a poor connection due to corrosion (with age). However, because you are getting a small current (you did not say how much!) the circuit is probably is complete and just the movement on the gauge is FUBAR. B4N

AR

**old Rusty C10** · 12-01-2003, 10:52 PM

i have a set of guages here with a good gas guage if ya need parts ill take $20 plus shipping for the entire guage set up with no tach

rfmaster · 12-02-2003, 02:15 AM

OK

If you look at the pic the back of the fuel gauge has three terminals. In the picture they are marked 1 2 3 (simple)

On my gauge, which I know is good for 1975 C20 resistance measures:

1 & 2 41 Ohms
2 & 3 141 Ohms
3 & 1 100 Ohms

I do not have factory wiring manual to see what each terminal does... Good Luck

tpjb57 · 12-02-2003, 10:21 AM

gonna check out gauge this wek, will let ya'll know what reading I get
Tom

Low87 · 12-02-2003, 10:28 AM

Here's how a friend of mine who's a mechanic checked mine. Hook up the ground, then hook up the power side to a live current, if the gauge pegs out, it's bad. That's what mine was doing anyways, and it didn't work.

12-01-2003, 05:05 PM	#1
tpjb57 Registered User Join Date: Oct 2003 Location: Mobile, Alabama Posts: 42	fuel gauge after replacing my sending unit and double checking the grounds I think my gauge is bad. Is there any sure fire way to check it before I tear it out? I am getting a small amount of current at the sending unit pink wire and the ground is good. Any ideas? Tom

12-01-2003, 05:57 PM	#2
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	I have a 1975 Fuel gauge out of my truck. I'll measure coil resistance with a DVM and let you know. Removing fuel gauge is not too difficult of a job . Also, the soft PCB circuit, which is used as a backplane for your instrument cluster may have a poor connection due to corrosion (with age). However, because you are getting a small current (you did not say how much!) the circuit is probably is complete and just the movement on the gauge is FUBAR. B4N AR __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

12-01-2003, 10:52 PM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	i have a set of guages here with a good gas guage if ya need parts ill take $20 plus shipping for the entire guage set up with no tach __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-02-2003, 02:15 AM	#4
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	OK If you look at the pic the back of the fuel gauge has three terminals. In the picture they are marked 1 2 3 (simple) On my gauge, which I know is good for 1975 C20 resistance measures: 1 & 2 41 Ohms 2 & 3 141 Ohms 3 & 1 100 Ohms I do not have factory wiring manual to see what each terminal does... Good Luck Attached Images __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

12-02-2003, 10:21 AM	#5
tpjb57 Registered User Join Date: Oct 2003 Location: Mobile, Alabama Posts: 42	gonna check out gauge this wek, will let ya'll know what reading I get Tom __________________ Tom 1985 SWB 2002 Harley Davidson Sportster Custom 1999 Cherokee

12-02-2003, 10:28 AM	#6
Low87 been here longer than Liz Join Date: Feb 2000 Location: Broken Arrow, OK Posts: 2,437	Here's how a friend of mine who's a mechanic checked mine. Hook up the ground, then hook up the power side to a live current, if the gauge pegs out, it's bad. That's what mine was doing anyways, and it didn't work. __________________ ~Greg~ Mac's Garage '87 SWB 6/8 drop "Piso" '08 CCSB Silverado DD the departed '89 GMC K5 Jimmy 4x4 "Rusty Nuts" '77 Chevy K5 Blazer 2wd '83 Chevy stepside "You get what you pay for" - Mike 'swervin ervin' Ervin



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