Note: costs mentioned below are given in US dollars as a general point of reference — actual prices vary by country, currency, and local market.
Find the blown fuse in the fuse box (usually one under the dash and one under the hood — check your owner's manual diagram), pull it with the plastic fuse puller clipped into the box lid, and check the thin wire strip inside: if it's broken or the plastic is discolored, it's blown. Replace it with a fuse of the exact same amperage rating — never a higher one, since the fuse's job is to fail before the wiring does. If a new fuse blows again immediately, stop and get the circuit checked rather than keep replacing fuses.
At a glance
| Symptom | Likely fuse/circuit |
|---|---|
| Radio/infotainment dead | Accessory or audio fuse |
| One set of power windows dead | Individual window fuse or shared circuit |
| Turn signals or brake lights out | Lighting fuse (check bulbs too) |
| Car won't start at all | Ignition or fuel pump fuse (or a bigger issue, not just a fuse) |
Where to find the fuse boxes
Most cars have two fuse panels: one under the dashboard (usually near the driver's left knee) covering interior electronics, and one in the engine bay near the battery covering higher-draw systems like the fuel pump, cooling fan, and headlights. The cover for each box has a diagram printed on the inside, or check your owner's manual for the layout.
How to check and replace a fuse
- Turn off the ignition and any accessory the fuse controls.
- Locate the fuse using the diagram, then pull it straight out using the plastic fuse-puller tool usually clipped inside the box lid (needle-nose pliers work if there's no puller).
- Hold it up to the light — a good fuse has an intact thin metal strip; a blown one shows a broken strip or scorched/melted plastic.
- Confirm the amperage rating printed on the fuse (a number like 10, 15, 20, or 30, often color-coded).
- Insert a new fuse of the identical amperage rating — never higher.
- Test the affected accessory to confirm it works.
A fuse is a deliberately weak link designed to fail before the wiring overheats. Installing a higher-amperage fuse "to stop it blowing" removes that protection — if there's a short circuit, the wiring itself can overheat and start a fire instead of the fuse simply blowing.
When a fuse keeps blowing
A single blown fuse with no repeat is usually just wear or a power surge and is nothing to worry about. A fuse that blows again as soon as you replace it (or blows within seconds of turning on the accessory) points to a short circuit somewhere in that wiring — chafed insulation, a pinched wire, or a failed component drawing too much current. At that point, replacing fuses over and over just masks the problem; it's worth having a mechanic trace the circuit with a multimeter.
Using a test light or multimeter
If you can't visually tell whether a fuse is blown, a simple circuit test light or multimeter set to continuity mode touched to both prongs of the fuse (with it removed) will confirm it in seconds — no continuity means it's blown.
Keeping spares on hand
A cheap assorted fuse kit (a few dollars) covering the common amperages your car uses is worth keeping in the glovebox. Fuses are one of the few parts where a wrong guess is genuinely low-risk to try, as long as you match — never exceed — the original rating.
Frequently asked questions
How do I know which fuse controls which accessory?
Can I use a higher-amp fuse if I don't have the right one?
Why did my fuse blow again right after I replaced it?
Do all fuses look the same?
Sources & further reading
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
