Good morning I need help my courtsey light will not go out I have pulled every fuse on the interior panel and still on its is killing my battery. I also have a relay chatering behind the radio I have replaced the ignition switch last year can any one help and does any one know were the courtsy lamp relay is HELP Please

 

The most common cause of the light staying on is the door latch switches. The switch for the dome light is part of the door latch in the door. Use some WD-40 or equivalent and soak the latch as best you can. This usually solves the problem but if not, you will have to replace the switch which means taking the door panel off. There are many threads about this here so do a search for more info.

Don't know if this will affect your chattering relay but it is a first step.

 

Fuse #14 under dash is for the dome, courtesy and cargo lamps.

If the cargo and courtesy lamps aren't staying on then there may be a wiring short to ground on the dome light wiring.

 

x2...i had the same issue on my rig...i got some PB Blaster, soaked the crap out of every latch, and viola'...no more "door ajar" or light staying on...surprised the heck out of me too...but, it works...