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| | | | Joined: Jan 2010 Posts: 41 New Guy | | New Guy Joined: Jan 2010 Posts: 41 | just got this truck a month ago, and have been tryingto get the fuel gauge going. replaced the dash unit. reads full constantly. realize there was no ground wire coming from the sender so i clipped a heavy speaker wire and made a ground, still reading full. looked at the chevy manual and checked the wiring diagram and now i think i may be missing some stuff. currently i got a brown wire running from the sender to the ignition spot on the fuse box. in the diagram it goes through a gas gauge connector, then into an instrument cluster connector then to the ignition switch. maybe i'm posting this prematurely, but ithought maybe someone might have some insight that would save me some minutes.. any thoughts? | | | | | Joined: Aug 2009 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2009 Posts: 50 | on my 65, im pretty sure the wire from the sender plugs into a spot on the fuse panel. not sure if its the same on a 62 | | | | | Joined: May 2007 Posts: 1,718 Moderator: 60-66 Trucks; North Eastern Bolters | | Moderator: 60-66 Trucks; North Eastern Bolters Joined: May 2007 Posts: 1,718 | Have you checked the sender? Lots of previous threads (as I recall) have a good discussion on the method to test sender, float, ground, and resistance. My wiring also goes to fuse panel. In my case my gauge is currently indicating from full to half. Half is where I run out of gas. Keeps things interesting.
HB | | | | | Joined: Aug 2009 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2009 Posts: 50 | mine is the same way. half=empty | | | | | Joined: Jan 2010 Posts: 41 New Guy | | New Guy Joined: Jan 2010 Posts: 41 | found some pics of a 65 fusebox, my sender wire is going to the same spot. so today i guess i'll check the float to make sure it's moving and make sure the ground is sound. or i guess i can just get gas regularly and call it good! | | | | | Joined: Apr 2005 Posts: 313 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 313 | I recently had that happen to my 1966 C-10. The copper strap in the sending unit was broken. I was able to fix mine by soldering in a piece of 12 gauge copper wire. 
Last edited by Doug 57; 01/22/2010 7:02 PM.
| | | | | Joined: Nov 2008 Posts: 98 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2008 Posts: 98 | also make sure you have a good ground from tank sending unit to the body | | | | | Joined: Nov 2006 Posts: 25 Apprentice | | Apprentice Joined: Nov 2006 Posts: 25 | The fuel gauge of this vintage, pre '65 works on 0-30 ohms.
0-1 ohms = E
15 ohms = 1/2
30 ohms = F
The brown wire at the fuse block is for the fuel gauge. From the fuse block the wire leads to the fuel tank sender.
From the fuse block male spade terminal the circuit leads to an in-line connector above the steering column then to the gauge.
Disconnect the brown wire at the fuse block and check resistance of the sender through the wire to ground.
At the terminal of the fuse block, wire disconnected, you can test the gauge operation.
With the terminal grounded and key on, gauge should go to E.
With 15 ohms of added resistance from this terminal to ground, should have 1/2 tank.
With 30 ohms of added resistance from this terminal to ground, gauge should go to F. | | |
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