courtesy lights

[walterz31]

hey,, guys new to the forum, I have a 02 expedition 5.4. about a week ago the rear passenger map light started flashing when I would go over a bump. now my courtesy lights (running boards, all dome lights) stay on all the time. I've checked the dimmer switch it's working fine, the door ajar light is off, all the lights stay on with the car off or on. I have to disconnect the battery at night so that battery won't drain.