Headlights not working properly

Ford has a recall for the lighting control modules in these cars. You can call your local Ford dealer with your vin number and they will let you know if your vehicle has had it done and if it applies to your car. Recall Number
15V861000
Recall Date
12/22/2015
Component
EXTERIOR LIGHTING:HEADLIGHTS
Summary
Ford Motor Company (Ford) is recalling certain model year 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles manufactured October 3, 2001, to August 2, 2005. The affected vehicles have a lighting control module (LCM) that may fail, resulting in a loss of headlights.

Consequence
A loss of headlights can reduce driver visibility and increase the risk of a crash.

What Owners Should Do
Ford will notify owners, and dealers will replace the LCM, free of charge. The recall began April 14, 2017. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 15S39.

I have seen the headlight switch go out in these. To be sure here is a guide to check for power loss with the headlight wiring diagrams so you can see how the system works and which wires to test. Also there are 6 fuses that run the system which need to checked as well.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Here are the fuse locations as well. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.