Originally Posted by llpainter
I understand the gauges have a two section measuring device and possibility the second section is not working properly.
I have picked up a used fuel gauge. Does someone know how to "bench" hook up the gauge to the potientiometer without installing it in the car?
Where the hot and ground go and where the ohms wires would clip to?
The "two section measuring device" sounds like they might be refering to the coils in the gauge. One is the empty coil and the other the full coil. The two coils pull on the pointer and which ever has the most "pull" pulls it towards that side.
Look at my 69 Camaro diagrams. This circuit description below refers to the diagram there. It will help you connect the test leads.
The FUEL GAUGE is controlled by varying the FUEL GAUGE SENDER resistance.
Current flows from the GAUGES FUSE to the EMPTY coil of the FUEL GAUGE and divides into two paths: 1, through the FUEL GAUGE SENDER to ground and 2, through the FULL coil to ground. These two coils exert a magnetic field on the needle, controlling its position. The gauge is controlled by changes of the FUEL GAUGE SENDER resistance.
When the fuel level rises, the FUEL GAUGE SENDER resistance increases, and less current flows through the FUEL GAUGE SENDER and the EMPTY coil. At the same time, the current in the FULL coil increases. This creates a larger magnetic field that pulls the
needle towards the full side of the gauge.
When the fuel level drops, the FUEL GAUGE SENDER resistance decreases, and more current flows through the FUEL GAUGE SENDER and the EMPTY coil. At the same time, the current in the FULL coil decreases. This creates a larger magnetic field that pulls the needle towards the EMPTY side of the gauge.