I have a 2011 E250. I attempted to install a Ford alarm system and clearly messed something up. The headlights will not turn off, no matter what. I had to pull the headlight fuses, the parking light fuse and the instrument cluster fuse to shut all the lights. Is there a relay or some sore of power module that I've damaged? I can't find anything like that in the fuse box diagrams. Thanks

 

Without doing some checks , it could be a module.

Many times a wire in the wrong place can provide the result you are seeing.. A VERY careful recheck of your work might get you out of this problem.

Better to recheck the instructions than worrying about messing up