Could be a lot of things, but check the 30 amp fuse under the hood first. If that is good, follow the power through the wiring diagram at the link below. http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=59697
SOURCE: how to replace the light bulb on exterior mirror 2003 ford expedition
The one with the turnsignal intergrated into it?
If so.....
Push the Mirror FORWARD, up close to the pivot poit there is a small torx head screw - unscrew that.
At the tapered end carefully pull/pry down. That end has a small metal spring clip that holds it up, be careful with it, if it snaps, you can NOT by a new one...
SOURCE: Help changing dome light bulbs in 2005 Accord
This is a real pain, took me forever to find mine... there is a little TINY slot that you can fit a VERY small flat head screwdriver in to pop it off.
Dont worry, the plastic is durable, just try to use a precision screwdriver if you have one and basically pry it open. it really will just Pop off once you get in there
SOURCE: f350 horn blows and dome light comes on randomly
I think you are right.Find the short and repair it or you can try to take the bulb out of the dome light and keep the switch on and see if that helps but you won't have a dome light.
SOURCE: 2000 Ford Expedition, power windows and dome lights won't come on
2000 ford expedition passanger power window wouldn't work
SOURCE: 1998 Ford Expedition "door ajar"
The door ajar switch is located inside the rear door face along with the latch. They can tend to get dirty and sticky over time. Using your favorite petroleum based lubricating spray, shoot it directly into the door latch area, being very liberal. Open and close your doors several times to make sure the switch is working freely. You should do this one door at a time so you can diagnose which door is causing the issue in case it resurfaces. Should be good to go.
Good luck.
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