1. Faulty Light Bulbs: Check the interior light bulbs, glove compartment light, and radio for any loose connections, damaged wiring, or faulty bulbs. Replace any defective bulbs or repair any damaged wirings.
2. Short Circuit in Wiring: Inspect the wiring connecting the fuse to the interior lights, glove compartment light, and radio for any damage, cuts, or exposed wires. Look for any points where the wires might be pinched or rubbing against metal surfaces, causing a short circuit. Repair or replace any damaged wiring.
3. Radio Malfunction: If the fuse blows whenever you turn on the radio, there might be an internal issue with the radio itself. Check for any loose connections, frayed wires, or signs of damage inside the radio. It may be necessary to have the radio inspected and repaired by a professional.
4. Grounding Issues: Ensure that the grounding points for the interior lights, glove compartment light, and radio are clean and free of corrosion. Poor grounding can cause a short circuit and blow the fuse. Clean the grounding points and ensure they are making good contact with the metal surfaces.
If you can't identify the specific cause, it's best to seek assistance from a qualified auto electrician. They can further diagnose the issue and ensure the electrical system is repaired correctly.