[ischmitz]

L_tuern9,

the common failure for these units is the wire wearing through and thus they fail open. I can't say why you saw nothing when you put the jumper in place. I would expect the needle to have moved.

To further test I'd go from the instrument out. All tests with the ignition in ON:

- Connect the input from the level gauge to GND and see if the needle moves up
- Measure the voltage on the input pin of the level gauge with ignition on. There should be some close to 12V.
- Then connect the wire back to the gauge, disconnect it at the sending unit and measure the same voltage. If not the wire is interrupted somewhere. When measuring connect the other lead of the voltmeter to the chassis or wheel lug
- Then measure the voltage by connecting the other lead of the voltmeter to the other connector near the sending unit - should still be the same.
- Finally touch the two connectors 0 - the needs to move\

As an alternative you can remove the sending unit and inspect it with a magnifying glass. The worn area will become apparent. You can even solder the constantan wire back together (worked for me) as a temporary fix.

Let us know what you find,
Ingo