Car Fuse Box Guide: Find, Check and Replace a Fuse
When a light, socket, radio or wiper suddenly stops working, a blown fuse is one of the first things to check.
Where to find the fuse box
Most cars have two: one inside the cabin (under the dashboard, near the driver's knees or behind a side panel) and one under the bonnet near the battery. The lid or the owner's manual has a diagram showing which fuse controls what.
How to check and replace a fuse
- Switch off the engine and remove the key.
- Find the fuse for the faulty item using the diagram.
- Pull it out with the small puller clip (or thin pliers).
- Hold it to the light. A broken thin wire inside means it has blown.
- Replace it with a new fuse of the same amp rating (printed on top).
Fuse colours (standard blade fuses)
5A tan, 10A red, 15A blue, 20A yellow, 25A clear/white, 30A green. Always check the number printed on the fuse.
⚠️ Never use a higher-amp fuse, a wire or foil instead of a fuse. This can overheat the wiring and cause a fire.
If it keeps blowing
A fuse that blows again and again is warning you of a short circuit, damaged wiring or a failing part. Do not keep replacing it; have the wiring traced. That is exactly what we do at the workshop.
Keep spares
Carry a small fuse kit with a puller in the glove box.