In ’63 the regulator is inside the fuel gauge. John is correct, 12V feed comes from ignition switch (not headlight switch), follow the print pp. 8-78 and 8-79 of ’63 shop manual, fuel and temp (idiot light for oil) only register when ignition “on” or “acc”, 12V from ignition switch goes to 5-pin connector on circuit board which feeds 12V to input on fuel gauge (Dave is correct on that), regulator in fuel gauge feeds pulsing 12V to fuel and temp. As John stated, regulator does not send steady 5.5V, it sends pulsing 12V that average out to about 5V. Carl — no has to come from ign or acc switch as they only read when that is on . look at print follow wire back to source from gauge regulator . I doubt it is that wire , they don’t suddenly get loose , but pc pins sure do yes —feed to regulator from car is 12 v , you said feed to gas gauge which is pulsating 12 v , from the mechanical regulator points .Feeds all three gauges - if you have 3 ? averages out to 5 v . they do that so gauges are not impacted by battery volts I agree with loose pins in pc card , I was thinking 60 F same circuit but no PC . PC cards in 67 Dart and Barracuda i have both had bad connections on board at plug pins . I soldered them all . tricky .Have to clean really spotless shiny with box cutter tip or solder will not “take ” factory only held pins by expanding them like a rivet , you wiggle plug they all get loose .
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On Oct 7, 2023, at 5:27 PM, dave mason <forwardlook300@xxxxxxxxx> wrote:
Hi John, I may be remembering wrong but I thought the gas gauge for 63-64 is fed with 12V from the 5-pin connector on circuit board. Then it uses “points” to reduce to 5.5V or so. That then feeds temp gauge too. So I believe there is actually 12V going to the circuit board feeding the fuel gauge. It’s true that if that ain’t working, the temp gauge wouldn’t either. Ground sender wire for temp gauge and see what happens, as you say. Where does the 12V come from that feeds the 5-pin connector and therefore the instrument circuit boards? I think it may come from the headlight switch… Dave
On Oct 7, 2023, at 16:58, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:
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