Fuel gauge wiring. problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**crossy** · 07-21-2009, 07:14 PM

anyone have an idea what color wiring is coming up from the fuel sender to the dash on an 81. my fuel gauge buries when the key is on. I forget if that means totally grounded out or open circuit on a fuel gauge. I have to tackle one disaster at a time with this truck from the P/O . thanx , crossy

glock35ipsc · 07-21-2009, 08:02 PM

I think tan, but let me find the schematics.

glock35ipsc · 07-21-2009, 08:06 PM

Or maybe pink

glock35ipsc · 07-21-2009, 08:07 PM

Here, I gotta go eat dinner.....

http://forum.73-87chevytrucks.com/sm...?topic=11766.0

**crossy** · 07-21-2009, 08:55 PM

link didn't work. crossy

glock35ipsc · 07-21-2009, 09:00 PM

Hmm, t's working here. Try CTRL F5, then click it again.

oldgmc · 07-21-2009, 09:57 PM

Link worked for me

**crossy** · 07-21-2009, 10:45 PM

I got it, but the ground could be any of THREE colors. ??
looks like pink for power and thats what #18 on the cluster connection was. #18 runs to the fuel gauge ,but so does #16 and #10 which are both grounds on the cluster. i thought fuel gauges were nothing but a meter/needle hooked to a resistor. I don't get the three wires with two being grounds? thanx ,crossy

warpig98 · 07-22-2009, 08:55 PM

so Crossy how you hookin urs up>

**crossy** · 07-22-2009, 10:03 PM

I found those schematics. One problem. i don't see a dual tank set up.

ANYWAY the idiot P/o removed the right tank. it uses only the left, but the switch inside cab was busted, one pink wire cut then it was shoved behind the dash. there is a Lt. green , Dk. green, pink & black wire running to the switch. ANYONE have an idea what it takes to bypass the switch. I still have no gauge at this point.

My tank had the PURPLE ground wire and i removed it, cleaned , re-installed. No change in gauge even when removed. I then found the tan/white (not pink)power wire and the connector. no change when unplugged. hmmm .

I REALLY need to know i have bypassed the switch right before i troubleshoot anything else.
thanx,crossy

**crossy** · 07-25-2009, 09:33 PM

well I havea working fuel gauge for the first time in ??? years. Too involved to explain, but i verified the sender was good with an ohmeter so i ran my own wire and spliced it in(correctly) to the 18 pin connector on the cluster.

THEN_ I found where the IPO had cut the pink wire. he used the fuse off the fuse box for the elestric fuel pump. I made things right. put fuel pump on a separate fused connection.

glock35ipsc · 07-25-2009, 10:49 PM

Nice!!!

07-21-2009, 08:02 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: Fuel gauge wiring. problems I think tan, but let me find the schematics. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

07-21-2009, 08:06 PM	#3
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: Fuel gauge wiring. problems Or maybe pink __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

07-21-2009, 08:07 PM	#4
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: Fuel gauge wiring. problems Here, I gotta go eat dinner..... http://forum.73-87chevytrucks.com/sm...?topic=11766.0 __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

07-21-2009, 08:55 PM	#5
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Re: Fuel gauge wiring. problems link didn't work. crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

07-21-2009, 09:00 PM	#6
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: Fuel gauge wiring. problems Hmm, t's working here. Try CTRL F5, then click it again. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

07-21-2009, 07:14 PM	#1
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Fuel gauge wiring. problems anyone have an idea what color wiring is coming up from the fuel sender to the dash on an 81. my fuel gauge buries when the key is on. I forget if that means totally grounded out or open circuit on a fuel gauge. I have to tackle one disaster at a time with this truck from the P/O . thanx , crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

07-21-2009, 09:57 PM	#7
oldgmc Registered User Join Date: Oct 2006 Location: nj Posts: 54	Re: Fuel gauge wiring. problems Link worked for me

07-21-2009, 10:45 PM	#8
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Re: Fuel gauge wiring. problems I got it, but the ground could be any of THREE colors. ?? looks like pink for power and thats what #18 on the cluster connection was. #18 runs to the fuel gauge ,but so does #16 and #10 which are both grounds on the cluster. i thought fuel gauges were nothing but a meter/needle hooked to a resistor. I don't get the three wires with two being grounds? thanx ,crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

07-22-2009, 08:55 PM	#9
warpig98 Registered User Join Date: Sep 2008 Location: arcadia, wisconsin Posts: 135	Re: Fuel gauge wiring. problems so Crossy how you hookin urs up> __________________ THANK YOU SOLDIERS!!!!! VISIT MY 78 BUILD THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=334884

07-22-2009, 10:03 PM	#10
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Re: Fuel gauge wiring. problems I found those schematics. One problem. i don't see a dual tank set up. ANYWAY the idiot P/o removed the right tank. it uses only the left, but the switch inside cab was busted, one pink wire cut then it was shoved behind the dash. there is a Lt. green , Dk. green, pink & black wire running to the switch. ANYONE have an idea what it takes to bypass the switch. I still have no gauge at this point. My tank had the PURPLE ground wire and i removed it, cleaned , re-installed. No change in gauge even when removed. I then found the tan/white (not pink)power wire and the connector. no change when unplugged. hmmm . I REALLY need to know i have bypassed the switch right before i troubleshoot anything else. thanx,crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks. Last edited by crossy; 07-22-2009 at 10:05 PM.

07-25-2009, 09:33 PM	#11
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Re: Fuel gauge wiring. problems well I havea working fuel gauge for the first time in ??? years. Too involved to explain, but i verified the sender was good with an ohmeter so i ran my own wire and spliced it in(correctly) to the 18 pin connector on the cluster. THEN_ I found where the IPO had cut the pink wire. he used the fuse off the fuse box for the elestric fuel pump. I made things right. put fuel pump on a separate fused connection. __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

07-25-2009, 10:49 PM	#12
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: Fuel gauge wiring. problems Nice!!! __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE



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