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Filled up the tank. First fill-up since I repaired the fuel gauge. Prior to fill-up, gauge and tank were between Empty and 1/4. Tank is now full to the bottom of the filler pipe.
Paid for the gas, turned the key, and the fuel gauge pegged Empty.
Using a multimeter, the sender wire reads 70 ohms, which is correct for a full tank.
Took the gauge out, used 68 ohm resistors to check the calibration, and all is well. One resistor reads full, two read half, and no resistance (sender terminal to ground) reads empty.
Put it back in the car, turned the key, gauge needle moves to the Empty peg.
My addled brain says this defies logic. If the sender is reading 70 ohms (it does), the gauge should read Full. With the 68 ohm resistor it does read full. But in the car, it reads empty.
Green wire connected tight to gauge battery terminal, green/black wire connected tight to gauge sender terminal, black wire to gauge ground (bracket thumbscrew).
What incredibly simple fact am I overlooking?
Tom
Paid for the gas, turned the key, and the fuel gauge pegged Empty.
Using a multimeter, the sender wire reads 70 ohms, which is correct for a full tank.
Took the gauge out, used 68 ohm resistors to check the calibration, and all is well. One resistor reads full, two read half, and no resistance (sender terminal to ground) reads empty.
Put it back in the car, turned the key, gauge needle moves to the Empty peg.
My addled brain says this defies logic. If the sender is reading 70 ohms (it does), the gauge should read Full. With the 68 ohm resistor it does read full. But in the car, it reads empty.
Green wire connected tight to gauge battery terminal, green/black wire connected tight to gauge sender terminal, black wire to gauge ground (bracket thumbscrew).
What incredibly simple fact am I overlooking?
Tom