Sign in to follow this  
Joseph P. Indusi

1940 Ford temperature sensor diagram

Recommended Posts

I am trying to help out a friend who has a 1940 Deluxe V-8 Ford.   The wiring diagrams show a very odd arrangement for the temperature, oil pressure and one other sensor.   They include a resistor and what looks like the symbol for a bi-metallic switch with a heater wire around the bi-metallic section.   I cannot understand how this works and I have seen two different versions of the sensor wiring diagram.   Does anyone on this forum know the theory of how this type of sensor wroks?

Thanks.

Joe

Share this post


Link to post
Share on other sites

Here is a link to a discussion on the theory behind these gauges. Basically both the sending unit and the dash unit have heated bi-metal switch. The current flow in the circuit moves the needle on the dash unit to indicate the oil pressure, fuel level or coolant temperature. This system provides a more accurate measurement than the variable resister units used in other vehicles.

 

https://www.fordbarn.com/forum/showthread.php?t=165773

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this