Two 940 wagons both with intermittent fuel gauges. Fuel senders and wiring were OK, as the correct sender resistance was measured at the instrument cluster connector.

First step was to remove the fuel gauge and resolder every connection on the circuit board. The gauge still didnt work when the instrument cluster was reinstalled. Next, an ohmmeter was used to check the resistance of the +12v path from the 4 terminal power input connector behind the speedometer through the fusible link to the +12v terminal on the fuel gauge. The resistance was several ohms when it should have been 0.1 - 0.2 ohms. Close inspection of the flex circuits showed there were several soldered jumpers in the +12v path. After resoldering the jumpers, the resistance of the +12v path dropped to 0.1 - 0.2 ohms. Resoldering the flex circuit jumpers fixed the fuel gauges on both vehicles.

Mike

1994 940 wagon 183K
1993 940 wagon 230K
1991 740 wagon 320K