Hi,
The ground for the rheostat itself is with the fuel pump. The body control module receives a fuel level sensor signal by supplying power to the rheostat which functions as a resister.
Does the fuel gauge do anything? I'm not sure what you are experiencing.
If you haven't already, we need to run the cluster through a self-test mode.
Follow the directions in pic 2. Once you determine if there is a code, follow the diagnostics in the remaining pics.
Let me know what you find or if you have other questions.
Take care,
Joe
See pics below.
Images (Click to make bigger)
Tuesday, September 20th, 2022 AT 6:39 PM