Fuel Sender Wiring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CHaingKaiShek · 01-22-2003, 10:39 PM

I cannot find a decent wiring diagram for a 1973 C-10 1/2 ton pickup. Well, I can find them, but none of them show what I need to know.

I need to know which wires control the fuel gauge - meaning which of the wires on the plug send the singals to the gauge itself. I'm in the process of adding new gauges, and will have to relocate all of them.

If anyone is able to help, either by telling me the colors of the wires or what position to find them in. I would much appreciate it

In the mean time here is a rough picture of just three of the gauges installed. Plan to try my best to make them look a bit better.

Thanks in advance, Jeff

wg77 · 01-22-2003, 11:09 PM

There is only two wires coming from the sender,1 is ground and the other is a tan wire .This should help you since GM stuck to the same colors for many years. Also,you have to match the gauge to the sender,depends on how many ohms there is at full and empty,to accurate reading.

*rustedchevy* · 01-22-2003, 11:30 PM

chaing-

tan is variable ground from the sending unit in the tank,

back of guage gets positive feed with key switch all the time on

apstguy · 01-22-2003, 11:48 PM

Let me bust out my handy-dandy Chilton's guide.... let me see here..... It says that wire is a tan/white wire. The plain tan wire is for the oil pressure sensor. There is another tan/white but it goes to the parking brake switch so don't get them confused. Happy working on your truck!

79BIG10 · 01-23-2003, 03:37 AM

See if this helps any. This is from teh back of teh fuel tank switch on the dash.

From the 3 o'clock position this is #1 wire then so on till #5 for reference.
#1- Ignition wire (pink w/ black stripe)
#2- Valve wire (lt. green)
#3- Tank Aux. (lt. blue)
#4- Gauge (tan)
#5- Tank Main (tan w/ white)
#6- Not used
With the ignition on you should get power with the #1 slot. If not check the pink w/black wire by following it to the fuse panel. Mine was connected with a male spade connector to a IGN slot. This way it's only powered when ignition is on (neing not running). Also you should have a light when testing for the #4 gauge as well (assuming it the #1 is hot).

01-22-2003, 10:39 PM	#1
CHaingKaiShek I love goooooold! Join Date: Jan 2003 Location: In the middle of Hell, Arizona Posts: 133	Fuel Sender Wiring I cannot find a decent wiring diagram for a 1973 C-10 1/2 ton pickup. Well, I can find them, but none of them show what I need to know. I need to know which wires control the fuel gauge - meaning which of the wires on the plug send the singals to the gauge itself. I'm in the process of adding new gauges, and will have to relocate all of them. If anyone is able to help, either by telling me the colors of the wires or what position to find them in. I would much appreciate it In the mean time here is a rough picture of just three of the gauges installed. Plan to try my best to make them look a bit better. Thanks in advance, Jeff

01-22-2003, 11:09 PM	#2
wg77 Registered User Join Date: Jan 2003 Location: Verona, PA Posts: 23	There is only two wires coming from the sender,1 is ground and the other is a tan wire .This should help you since GM stuck to the same colors for many years. Also,you have to match the gauge to the sender,depends on how many ohms there is at full and empty,to accurate reading.

01-22-2003, 11:30 PM	#3
rustedchevy Account Suspended Join Date: Jan 2003 Location: il Posts: 115	chaing- tan is variable ground from the sending unit in the tank, back of guage gets positive feed with key switch all the time on

01-22-2003, 11:48 PM	#4
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	Let me bust out my handy-dandy Chilton's guide.... let me see here..... It says that wire is a tan/white wire. The plain tan wire is for the oil pressure sensor. There is another tan/white but it goes to the parking brake switch so don't get them confused. Happy working on your truck! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

01-23-2003, 03:37 AM	#5
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	See if this helps any. This is from teh back of teh fuel tank switch on the dash. From the 3 o'clock position this is #1 wire then so on till #5 for reference. #1- Ignition wire (pink w/ black stripe) #2- Valve wire (lt. green) #3- Tank Aux. (lt. blue) #4- Gauge (tan) #5- Tank Main (tan w/ white) #6- Not used With the ignition on you should get power with the #1 slot. If not check the pink w/black wire by following it to the fuse panel. Mine was connected with a male spade connector to a IGN slot. This way it's only powered when ignition is on (neing not running). Also you should have a light when testing for the #4 gauge as well (assuming it the #1 is hot). __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson



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