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Originally Posted by '46Ford
55 Ford, Fairlane, 272, converted to 12V system. The fuel gauge on the dash will not read properly. Goes to full when tank is full, the needle will fluctuate down and up when driving, going from full to half or quarter then back to full. I've put in a new tank, sending unit, checked wiring going from tank to gauge, not grounding anywhere. Is the 12V conversion an issue with the gauge. The needle on the gauge jumps a little when going up from empty when I first turn the ignition on. Any insight on the issue is appreciated. Thanks in advance.
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Hill's Thunderbird lists a dropping resistor for when 55's Birds are changed over to 12V . P/N 9280-DR for $29.95. I have also seen at the H.A.M.B. where someone talking about Ford fuel gages said they were 6V up into the 1980's. Do you have an instrument voltage regulator (also called the resistor) in your wiring circuit? You can also try P/N 10804 at a regular supply house.
Hill's catalog also has a note that says "55 fuel gauge has 11-12 OHMS resistance. 56 has 38-40 OHMS resistance and 57 has 13-14 OHM resistance. Measured from terminal to terminal."