Resistance wire for thermostat sender unit

Does anyone know the actual resistance of the resistance wire that is between the water temperature sender unit and the actual gauge?

https://i.servimg.com/u/f44/19/88/21/89/thermo10.jpg

I've seen that as well, but did not have the original wire.
Really makes almost no sense to me. I have the orig gauge and a plain cable with a new sending unit (conforming to typical Mopar application: 13-76 ohms).

That might not be a resistance wire in the schematic,,,,Dodge uses a current limiter built into the fuel gauge and runs a wire from it to power the temp gauge,,,that might be what the wiring diagram means,,,,so how about one of you see what the voltage is at the end of the temp wire with it connected and disconnected just to see what it is.

The fuel gauge''s (mechanical) limiter puts out approx 6V. That's the usual voltage at Mopar instrument voltage limiters.
Fuel gauge and water temp gauge are powered by it.

I've yet to see another Mopar setup with a resistance wire with those standard gauges and standard temp sensors...

Hi!!
That resistance cable if  for the scenario of temp sending unit fail grounded. Then, the temp gauge fries.
I don´t know the value, but it must be below 10 ohm.

Happy vanning.

Possible thought, but no other Mopar of those years has a resistance wire.

And, to be honest - if the temp gauge goes beyond "hot" you better shut off the engine anyway....

69 wrote:Possible thought, but no other Mopar of those years has a resistance wire.

And, to be honest - if the temp gauge goes beyond "hot" you better shut off the engine anyway....

Think in that scenario:
You drive in a hot summer day and your temp gauge indicates correctly.
You stop your car for lunch. The temp of the engine rises over the normal limits and stay this way during long time.
All this time the temp sender is sensing passing his limit during this long time and fails burning and a close the circuit to ground with ZERO ohms.
When you return to your car after the coffe, you start the car and the grounded temp sensor makes your gauge moves the needle to its maximun way. After a few seconds, your gauge is melted.
If you would have a small resistance wire into the sender cable, your gauge would indicates a little lower than its maximun way and no melted gauge.
Then you stop the car and see what´s happening.  

Enjoy.

dodtorcito wrote:

69 wrote:Possible thought, but no other Mopar of those years has a resistance wire.

And, to be honest - if the temp gauge goes beyond "hot" you better shut off the engine anyway....

Think in that scenario:
You drive in a hot summer day and your temp gauge indicates correctly.
You stop your car for lunch. The temp of the engine rises over the normal limits and stay this way during long time.
All this time the temp sender is sensing passing his limit during this long time and fails burning and a close the circuit to ground with ZERO ohms.
When you return to your car after the coffe, you start the car and the grounded temp sensor makes your gauge moves the needle to its maximun way. After a few seconds, your gauge is melted.
If you would have a small resistance wire into the sender cable, your gauge would indicates a little lower than its maximun way and no melted gauge.
Then you stop the car and see what´s happening.  

Enjoy.

I managed to find my original wiring loom, and it has some resistance built in - it's like a nichrome wire/resistance wire.... I measured 5.1 ohms.

Looks like I will just build a 5W porcelain resistor to that measurement and hide it in the loom behind the dash.

Thanks for the contributions to the question.