Where is the low fuel warning light module on a 1985 ford crown Victoria?

There isn't a separate "low fuel warning light module" in a 1985 Ford Crown Victoria (or most vehicles from that era). The low fuel warning light is a simple system. It's controlled by a fuel level sending unit located in the fuel tank. This unit is a float-type sensor that sends a variable resistance signal to the instrument cluster. When the fuel level drops below a certain point, the resistance changes, triggering the light in the instrument cluster.

Therefore, there's no single module to troubleshoot. The problem likely lies in one of these two areas:

* Fuel level sending unit: This is the most common culprit. It can fail due to age, corrosion, or a faulty float.

* Instrument cluster: Less common, but a problem within the instrument cluster itself (a burned-out bulb or a faulty circuit) could also prevent the light from working.

To diagnose the problem, you'll need to test the fuel level sending unit's resistance with a multimeter and check the wiring connections between the sending unit and the instrument cluster. A wiring diagram for your specific year and model will be helpful. You can often find these online through forums dedicated to classic Ford vehicles.