Dennis Detweiler Posted September 27, 2018 Report Share Posted September 27, 2018 (edited) I put a new tank and fuel sending unit in in my 39 Plymouth. Before I put gas in it, I hooked up the battery and the fuel gauge went to full. So, I reversed the wires on the sender and it went back to empty. Then, I put 10 gallons of gas in the tank and the gauge needle moves from far left up to slightly past empty. When I turn the ignition switch off it bumps up a little then goes back to far left. With 10 gallons in it, the guage should read at least half full? Edited September 27, 2018 by Dennis Detweiler more info Quote Link to comment Share on other sites More sharing options...
TodFitch Posted September 27, 2018 Report Share Posted September 27, 2018 I think 1939 was the first year for the two wire fuel gauge used through 1948. It takes a different type of sending unit that earlier or later cars, did you get the correct sender? 1 Quote Link to comment Share on other sites More sharing options...
knuckleharley Posted September 27, 2018 Report Share Posted September 27, 2018 14 minutes ago, TodFitch said: I think 1939 was the first year for the two wire fuel gauge used through 1948. It takes a different type of sending unit that earlier or later cars, did you get the correct sender? Thanks,Tod. I had no idea. Quote Link to comment Share on other sites More sharing options...
Dennis Detweiler Posted September 27, 2018 Author Report Share Posted September 27, 2018 (edited) Yes, it's a two wire plus I grounded the sender to the frame. Edited September 27, 2018 by Dennis Detweiler added info Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 27, 2018 Report Share Posted September 27, 2018 a to a b to b....be sure there is continuity on these wires gauge to sender....be sure you have the voltage supplied to the gauge.....the gauge also has a built in 5 volt regulator... Quote Link to comment Share on other sites More sharing options...
Dennis Detweiler Posted September 27, 2018 Author Report Share Posted September 27, 2018 The whole car has been rewired and schematic made in the process. I've been on-line finding info on the guage. I looked at my wiring schematic and I did replace the three wires from the guage. It's a pretty simple wiring project, so I doubt anything is lacking continuity. Since the guage went to full on an empty tank and I switched the wires around, it should be showing at least an approximate half tank of fuel after I put in 10 gallons. I'm guessing the resistor or points aren't functioning on one side of the guage. As luck would have it (not that often), I found a NOS 39 guage still in the box on ebay. So, I bought it. Quote Link to comment Share on other sites More sharing options...
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