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| | | | Joined: May 2015 Posts: 17 New Guy | | New Guy Joined: May 2015 Posts: 17 | Hello to all
I have a 55 chevy 3600 pickup and had a question on the gauges. My fuel gauge ain't ready , sonic replaced the fuel sending unit and nothing so I'm assuming its the guage. Should the fuel gauge have a grind on it? My gauge has two prongs on it. Also my trucks wiring has no fuse box none what so ever. | | | | | Joined: Oct 2013 Posts: 219 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 219 | Hello, Sorry I don't understand the grind?
The "Sender" post should connect to the green wire (Behind F)the "IGN" post should connect to the pink or light red wire (Behind E) no fuse required. Do you have any wires hanging back there? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | double posted grind = ground (probably) | | | | | Joined: Oct 2013 Posts: 219 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 219 | Ah I see Thanks Tim!
I believe The sender grounds on itself. The Gauge grounds itself on the cluster housing. I'll look at mine tonight. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The sender top/mounting plate should be grounded. The quality of this ground can be tested with by a continuity test between the frame (or other good ground) and a sender mounting screw on the fuel tank. | | | | | Joined: Mar 2010 Posts: 10,279 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,279 | May have to do some "grind"ing to get a good ground. 
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jun 2015 Posts: 1 Moderated | | Moderated Joined: Jun 2015 Posts: 1 | I have a situation where my fuel gauge and sender bench test perfectly. Then, in the truck the fuel gauge works great until I start the truck. Then it gets Parkinson's and jumps around, often up behind the F, but will sometimes settle at just the right RPM. This is a 12 volt conversion '53. I have had the alternator tested, and replaced the coil resistor, and added a ground at the tank. All gauge lights work good, so I'm assuming the cluster ground is adequate.
Suggestions? | | | | | Joined: Mar 2010 Posts: 10,279 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,279 | If you have an intermittent "past full" symptom, you likely have an intermittent "no ground" situation.
Find a better (or cleaner) place on the frame for the ground wire coming from the base of the sending unit.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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