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#1 |
Registered User
Join Date: Jan 2012
Location: Las Vegas
Posts: 21
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Fuel gauge wire...? Location
It's been awhile since I've posted, over the last 2 months I've wrenched a new blueprint 355 engine into the truck. Lots of new parts etc.
I thought I had everything labeled and marked, well I've got one damn wire i didn't pay attention to. It's pink in color, runs across the crossmember to the right side tank, but routes up towards the firewall. It has a small rubber junction and when separated one side has a pin. My gas gauge pegs to the 3 o'clock no matter what tank I select, never had this problem before I tore everything apart. They always worked. The wife printed of some schematics for me and I just can't seem to figure it out. It's a 1978 K10 with dual tanks short bed fleet side. Any help would be greatly appreciated Thanks much, David. I tried jumping the wire to both sides of the battery and that did nothing. |
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#2 |
Registered User
Join Date: Jan 2011
Location: Port Coquitlam, BC
Posts: 202
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Re: Fuel gauge wire...? Location
IIRC, (and somebody jump in if I'm mistaken) the pink fuel gauge wire works on resistance, not power or ground. As a result, if the fuel gauge pins at full reading, then the circuit has zero resistance meaning the wire is grounded somewhere. I had the same problem when I bought my stepside and it turned out the P/O had squashed the wire under the box and it was finding ground through the frame. Sounds like you have a short somewhere.
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Proud UA member since 2009 My LT1 Silverado build-up: http://67-72chevytrucks.com/vboard/s...d.php?t=549660 Check out my new YouTube channel! - https://youtube.com/channel/UCXk5mZOQI1sEnu5bIkhe7fA |
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#3 |
Registered User
Join Date: Jul 2011
Location: back 40, bc
Posts: 3,817
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Re: Fuel gauge wire...? Location
yup, the pink is for your gauges, if the wire is crimped or crushed & touching metal, your gauges will go to 3:00. happened to me last yr.
easiest way, put a jumper from the junction to the sender, if it cures your problem start tracing the pink till you find the short |
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#4 |
Registered User
Join Date: Jan 2012
Location: Las Vegas
Posts: 21
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Re: Fuel gauge wire...? Location
I've been looking for the camera to take some pics, wife has it stashed somewhere.
I guess a better way to ask is where this wire was terminated originally ???? I have the wires coming thru the frame, one is ground for each tank, terminated at the frame. And one each for the sending units going back to the plug in the firewall. It's this third wire in the harness I can't figure out. It's more red in color. I do appreciate your help so far. |
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#5 |
Registered User
Join Date: Feb 2014
Location: Granite Falls, WA
Posts: 84
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Re: Fuel gauge wire...? Location
Mine is the opposite. The pink wire was broken and open circuit causing the gauge to read 3 o'clock. Shorting the wire to ground made it go to empty. When hooked up correctly the gauge read correctly. 76 Stepside
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#6 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Fuel gauge wire...? Location
Yes
open pink is over full Grounded is lowest point it goes on E
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#7 |
Registered User
Join Date: Dec 2007
Location: Kimberley, BC, Canada
Posts: 799
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Re: Fuel gauge wire...? Location
Try connecting the pink wire through a bulb to ground. This should make the fuel gauge read empty, assuming the ignition key is on. If it doesn't, the wire has a break in it somewhere.
Good luck!
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Greg 64 GMC Suburban - 283, NV3500, 14 bolt 77 C10 swb - 292, SM465, 12 bolt |
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#8 |
Registered User
Join Date: Jul 2011
Location: back 40, bc
Posts: 3,817
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Re: Fuel gauge wire...? Location
yup, my bad, wrong wording. ultimately whats it really matter though, you still have to go trace out the problem in the wire harness wether it's been sliced, or grounded. considering even the newest square is over 20 yrs old now, why bother fixing old wires, go with new! instead of spending time chasing the wire, i replaced the pink from the firewall plug to the switching unit, took all of 10 minutes & had my gauge working again. i did go back later & fish the old pink wire out, one of the clamps had cut it...
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