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EFV-8 Club Forum / 1940 Ford Discussion / Temperature sending units

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40 Coupe

12-10-2024 @ 4:45 AM

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Your welcome!

Av68@reagan.com

12-08-2024 @ 10:03 AM

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Jay & 40 Coupe, I am grateful to you for taking the time to answer my questions and share your knowledge with me about my gauges. It is very much appreciated. I feel accomplished. God bless.

JayChicago

12-06-2024 @ 7:56 AM

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Yep, you have it wired correctly, and the gauge is performing as designed. In the end, a job well done.

Note all four gauges rest at their worse-case position. Then if a loose/cut sending wire develops, fuel gauge goes to empty, oil pressure goes to zero, voltage meter shows no voltage, and temp. gauge reads hot. I suspect that was Ford engineers trying for "fail safe" design, so driver is warned of a failed gauge.

40 Coupe

12-06-2024 @ 5:35 AM

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The temperature dash gauge does read Hot when not energized. when the car is turned on it goes to cold and slowly rises with the water temperature increase.
If the dash gauge were to stay at the hot position when first turning the engine on then the two terminal sender would be defective. The two terminal sender is normally a closed circuit that when it senses over temperature opens circuit, when the engine cools down the sender resets to the closed position.

Av68@reagan.com

12-05-2024 @ 6:11 PM

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All the other three gauges move from left to right when I turn the key to unlock the wheel and I flip the toggle switch to the ‘on’ position. They remain that way with the engine running. The temp gauge however, rests in the far right (hot) position with the engine turned off/cold engine. When I turn the key and flip the switch to the ‘on’ position, the needle returns to the far left and remains there after the engine turns on. As the engine warms up, the needle moves to the right.

Back to the engine; I took the original temp sensor ( the one on the drivers side, marked with KS) and installed it on the passenger side where I had a brass plug. Then I installed the new temp sending unit with the two connections on the drivers side. Then I connected the crossover wire to one connection and the wire back to the temp gauge to the other connection point.

Side note; When I rewired my car from 6v to 12V using Vintage Auto Garage, the kit came with a voltage reducer. This voltage reducer provides a’ check’ system with red and green lights to warn whether or not the gauges were wired correctly. When two green lights are on, it means the gauges are wired correctly. I have these two green lights. I thought maybe I had a wire crossed with my gauges, but doesn’t appear so.

JayChicago

12-05-2024 @ 12:42 PM

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Good that grounding wire has been removed from the switch/sender, was providing a dead short to ground.

Gauge now reading backwards?? Please describe what the gauge is doing.

Av68@reagan.com

12-05-2024 @ 11:32 AM

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Yes. On the two terminal sending unit ( on drivers side) , I have the black wire from the dashboard connected to one terminal and on the the second terminal, I ran a jumper wire to the new sending unit on the passenger side. I removed the grounding wire. But now my temp gauge at the dash reads backwards.

Av68@reagan.com

12-05-2024 @ 11:29 AM

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Thank you for your response. Yes, the wire (black) goes from my dash gauge ( which is part of the original dash cluster of gauges & speedo) to the temp sending unit, which is now a new two terminal sending unit. Then the second terminal has a jumper running to the single terminal on the passenger side of the engine. But now, the temp gauge on the dash runs backward. When I had just the one temp sending unit on drivers side and a plug on the other side, the gauge read in the correct direction. ???

JayChicago

12-05-2024 @ 10:41 AM

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How did you connect the new ground wire to the switch/sender? Is it on one of the two terminals?

40 Coupe

12-05-2024 @ 6:50 AM

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No grounds needed. Wire from dash gauge goes to the two terminal unit. The second terminal on the two terminal unit is a jumper to the single terminal unit.

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