Door Courtesy Dome Light Switch not working

Updated 2024/09/17 Show how to fix/repair a door courtesy light/dome switch instead of replacing it. Take the switch apart, clean the parts, lubricate the parts, put it back together. This may not be the same switch that's in your car, but you can use the same idea for most switches.
As @SergSpace suggested, CRC 05103 QD Electronic Cleaner is a spray that will clean surfaces like this.
Be sure to check for a good ground connection where the switch and/or bolt goes into the body of the vehicle. If it's rusty, the light will be dim, flicker, or won't work. Clean the rust and put a little grease or silicone paste on the area to prevent future rust.
You can get a small pack of dielectric grease (bulb grease) at the auto parts stores. Or if you do a lot of repairs, get a tube for a few more dollars. Note: The lids suck on most products. You can use a wire nut to replace the lid when it strips or cracks.
You may be able to glue the switch pieces together, but the glue may get into the switch mechanism.
If you plan on using LED lights, many cars only use the door switch as a signal to the computer. The computer controls the dome/courtesy light. Most cars like this dim the light by providing a pulse to the light that doesn't work well with LEDs.
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