I've tried everything and the lights won't turn off when mycar is running .
SOURCE: Ford 2003 Windstar Interior Floor Lights Stay On
to repair this problem you must remove floor lights from seats and check the circuit for either a short or a stuck switch use a multi tester this can get to be irritating as the short may be not directly behind switch could be along wiring that runs through car my suggestion if your not electrically proficient is take it to an electromechanic shop or simply unplug the light from socket to avoid draining the battery.
SOURCE: 2003 ford expedition "door ajar" & interior lights staying on
the wire on the door latch make sure they are plugged in or unplug it and the light should go out if it does not then it's not that door
SOURCE: A diagram of a 2003 Ford Mustang interior fuse box?
Fuse Box Diagram
Circuit Schematic
I trust that these are what you are looking for, they are screen captures of the requested information right from Ford.
SOURCE: 2003 Ford Mustang GT Battery Light
Your alternator should power everything when engine is running. Battery is only for start up. Test voltage with a multimeter when engine is running , should be 14V or more . Any less indicates low alternator output.
SOURCE: A diagram of a 2003 Ford Mustang interior fuse box?
here you go
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
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