1999 Ford F-250 interior dome light

How do you mean can't install it? Is there no place for it or?

So are telling me that it won't come on? It is two wire both power. The light when it is screwed in grounds through the body with one of the mounting screws. I need to know if this is a F250 super duty or not to get the right wiring diagram. Get back to me with that.

I am thinking it is either a door pin switch or the Gem module or interior lamp relay. Do you have a test light or digital multi meter so we can do some tests to figure out witch? So tell me is there any other lights that don't work inside? Here is what I see with the wiring diagram. It starts with fuse 14 (10 amp) in the junction box behind the lower leftfront of the dash. Then to the interior lamp relay then it goes out the interior lighting (all). So the other thing I need to know is regular or extra cab or 4 door? So check for power at the blue wire with the black stripe for power when the door is open or when you turn the switch on. If now power then I need you to check for power at the orange wire with the light green stripe that goes to the main dome light switch. Let me know what you find.

Ok of course you can go to Ford or you can go to your local parts store. Napa part number is AR606 and looks to cost about 8 dollars. Let me know if this takes care of it.

Thanks and do let me know how it goes. If this don't fix it then we will look into other things. Did you buy this truck used and the dome light didn't work? I am thinking that the light wouldn't go off, so they removed the relay, if that is the case then you will need to replace the door pin switches that turn the light on and off. Let me know how it goes.

Ok so just to go over things lets see if there is power first. Now fuse number 4 and number 14 check them both should be 10 amp. My next question is do any of the courtesy lights work? I know the dome light don't work but does the glove box light work and the under hood light etc? Also what color wires are at the dome light?

I could also be that the GEM Module is not doing its job but we will check that when we get to that point. At this point just make sure you have power in and out ot fuse 4 and 14. Get back to me with that so we can figure out where to go from that point.