2 things to look for. the switch on the dome light itself and the door switches. These switches make a ground connection so the bulb will light. The dome light switch may be faulty allowing current to flow all the time. The door switches do the same with one exception. The wire going to each door switch can become pinched or come in contact with a sharp body part causing the dome light to stay on. Check the obvious first before you start tearing the interior panels apart.
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 Explorer door ajar light stay on when all doors are closed
I had this problem on my 2003 explorer and took WD40 and gave the lock mechanism a good dose where it meets the clasp on the door jam. Then open and close the doors a couple of times to get them working. They get gummed up and sometimes have a tendency to stick.
SOURCE: 2003 ford explorer battery light on
Are you sure the alternator isnt "over" charging? if not, you may have a "loose" connection somewhere with the cables, or a malfunction in the dash cluster. Also, are you positive the battery is forsure good?
SOURCE: how to replace blend door actuator in a ford
I recently did mine, I hear you can do it without taking the entire dash apart but I had no luck with it myself. I have to get ready for work but, on mine it was located down and to the left of the radio. its a white box...are you hearing a clicking noise or something? I had to roll the entire dash back and it was still a major pain getting it out.
SOURCE: 2003 Ford Explorer Limited. Door
I had the exact same problem with my 2003 Ford Explorer Eddie Bauer. Each time I pressed the rear defrost button, the door adjar light came on. The problem was a broken ground wire in the wiring harness that ran into the drivers side door. Pull the rubber boot back on the wiring harness between the drivers door and and body and look for broken wires. There are a lot of wires so you will have to look very close. I inserted a 1 1/2 inch wire splice to reconnect the black wire and everything now works fine. This splice also fixed the problem with the drivers side- side view mirror light. I have researched and discovered that many Explorers have this problem.
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