Why are all the interior lights in the car not working?

[DelJosiah]

When all the interior lights in the car are not working, it is usually due to poor contact at the battery terminals. The battery has positive and negative terminals, each connected by wires. The connection points are prone to oxidation, leading to poor contact. The solution is to pour hot water over both terminals to clean them, tighten the screws at the connection points with a screwdriver, and then apply grease to prevent future oxidation. The interior lights in a car include reading lights and ambient lights. Reading lights are installed inside the car, typically above the driver's seat and in the middle of the rear seats, to facilitate reading inside the vehicle. Ambient lights serve a decorative purpose and usually come in colors such as red, blue, or green.