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I have a 63 2a recently converted to negative ground with an alternator. The original fuel sender has long ago rusted away and has been blanked off. It does have the original fuel gauge. I bought a negative ground sending unit (RN#PLE494) when I test it dry the gauge reads full when the float is bottomed out and vice versa. I reverse the wires on the gauge and it just pegs out full with nothing in between. Is there a remedy or do I need the series 3 gauge? I have two 63 gauges and they both act the same.
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guage voltage may be modulated to 5vdc as with most guages anymore. you sure don't want 12 volts going into the gas tank !! -
The ground be it positive or negative makes no difference to the way the the gauges work. It just happens LR changed the gauges at the same time as they changed the ground . You need the sender relative to the gauge which is a 1963 one. The symptoms you have reflect exactly to having the later but wrong sender unit . Your gauges have a pointed needle , the later ones which use a 10 volt regulated supply have a blunt end to the needle. You have two options. Get the correct sender ,Rover part 519838 or change the gauge to the S3 type plus fit the voltage stabiliser to give the 10 Volt supply , Rover part 148876. Your gauge is a moving coil type and the later are bi metallic, which give a damped response so they don't move around a lot when driving.
As an aside, the sender unit is a fairly standard UK Smiths part fitted to many UK vehicles such as MG Triumph etc and often the only difference is the Float arm length depending on the tank dimensions . . The Smiths number for 519838 is FT 5347/07. I have known owners get a sender unit off say an old MG , with the wrong length arm and cut the the float off both & solder the two arms together to get the right length on the new sender . The voltage stabiliser is also a standard part fitted to many UK cars of the periodComment
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Finished the install of the new series III sender and the old gauge w/o a voltage stabilizer. I bent the down rod 180 degrees to the other side and soldered on an extension and an extra stop to restrict the “full” travel of the float. Everything seems to be functioning. The sender has a low fuel warning terminal. I may try to find a place for a warning lamp on my dash. Thanks for the input.Comment
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with a '63 2A it won't be hard to find a place for extra guages. I really think i like my 2A better than my s3 (last one sold on the west coast)Comment
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