CJ Fuel gauge / sensor issue
I would greatly appreciate any help or advice. I have followed test instructions including running a new & separate ground from the neg battery post to both the speedometer housing and fuel level sensor. I temporarily crossed "I" to "S" to test fuel gauge and it moved to full, so I know the gauge works. I get solid test light at "I" on fuel gauge but no needle movement on Gauge. I get dimmer flashing on "S" on fuel gauge, but no needle movement on Gauge. I ran a separate line from "S" directly to fuel level sensor. I get flashing at wire end at tank. When I replace wire on fuel level sensor and contact test light to contact pin on fuel level sensor,I get dimmer flashing AND THE FUEL GAUGE WORKS. It registers about 1/4 tank on the gauge. When I remove test light from the contact pin on fuel level sensor, the gauge stops working. I don't know where to go next. Can I run a wire from the contact pin on the fuel sensor to a good ground? It seems that the gauge only works when I essentially short the sensor wire at the tank. I also ran a hot "+" from the battery and touched the probe to the top of the fuel sensor proving a good ground at the fuel level sensor. Thanks...