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12-12-2017, 02:14 PM | #1 |
Junior Member
Join Date: Dec 2016
Location: San Diego
Posts: 8
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Temperature Sender Wiring
I'm trying to fix the temperature gauge on my 40 Ford. It reads H at all times. There is only one temperature sensor on the left bank. I see it is wrapped with teflon tape. That may be my problem (no ground)as I have read other posts on this forum.
I found a NOS temperature switch in my trunk. It is wrapped in wax like paper and is brand new. I plan to install it on the left bank where the gauge wire is and put the temperature sender on the right bank. I would appreciate a photo of the wiring from the right bank to the left bank so I know the route that was original to this car. I am very grateful for this forum. |
12-12-2017, 02:26 PM | #2 |
Senior Member
Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: Temperature Sender Wiring
There should be a temp sensor in each head. The one with one terminal is connected to one of the terminals on the sensor with two terminals. The remaining terminal goes to the temperature gauge. The only variable sensor in the one terminal type. The two terminal sensor contains a bimetal switch that opens when the temperature reaches the boiling point, opening the circuit and sending the gauge to the "hot side" of the dial. The two sensors are connected with a short wire between them that crosses the engine.
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12-12-2017, 02:59 PM | #3 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Temperature Sender Wiring
Not likely it is grounded through the tape on the threads.
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12-12-2017, 06:02 PM | #4 |
Senior Member
Join Date: Nov 2010
Location: NM
Posts: 2,438
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Re: Temperature Sender Wiring
If the sender that's installed is the 1-terminal type, running a jumper from the body of the sender to ground will quickly verify.
__________________
'52 F-1, EAB flathead |
12-12-2017, 06:18 PM | #5 |
Senior Member
Join Date: Sep 2016
Posts: 628
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Re: Temperature Sender Wiring
Not having a '40 F I can't provide a visual but I can provide a verbal. The wire from the temp gauge passes through the firewall and connects to one terminal of the dual terminal sensor in the drivers (left) head. A short piece of wire is connected to the other terminal of that sender and goes across the engine under the generator to the single terminal sensor in the passenger (right) head. If it still doesn't work, do the battery test connecting the wire from the gauge to one cell of a flashlight battery connected to ground. The gauge should read mid-scale. Grounding the gauge wire should make the gauge read near the bottom ("L").
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12-12-2017, 07:07 PM | #6 |
Junior Member
Join Date: Dec 2016
Location: San Diego
Posts: 8
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Re: Temperature Sender Wiring
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Last edited by homeboymi; 12-12-2017 at 08:06 PM. |
12-12-2017, 07:37 PM | #7 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Temperature Sender Wiring
Yep, the gauge passed the test!
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