In most cars, the radio fuse is inside an interior fuse panel, often behind the dash on the driver's side or in the glove box. The fuse is usually labeled RAD, RADIO, or AUDIO and is typically rated from 10 to 20 amps.
Where to look for the fuse
Fuses for the radio are commonly found in two places in modern vehicles. The exact spot depends on the make and model, and some cars use a combination of panels for different power feeds.
- Interior fuse box on the driver's side of the dash, sometimes behind a small access panel.
- Glove box fuse panel, which may require opening the glove box and removing a cover.
- Under-hood fuse/relay box near the battery or firewall, especially if the radio is fed from an ignition/ACC circuit.
- In a few models, a separate fuse may exist in a rear fuse panel (often in the trunk) or in a location tied to an aftermarket stereo installation.
Understanding the exact location depends on your vehicle’s make, model, and whether you have a factory radio or an aftermarket unit. If in doubt, start with the owner’s manual or the diagram on the fuse box cover.
How to identify the correct fuse
To pinpoint the right fuse, consult the vehicle’s fuse diagram and look for labels tied to the radio function. If the label isn’t obvious, inspect related circuits such as ignition/ACC feeds and memory circuits that keep presets or clock data.
- Look for fuses labeled RADIO, RAD, AUDIO, or similar terminology on the interior or engine-bay fuse blocks.
- Check the fuse amperage; radios typically use 10A, 15A, or 20A fuses depending on the car.
- Note that some cars route radio power through the ignition/ACC circuit, so the fuse may be in a panel that powers other ignition-fed accessories.
- Some aftermarket radios use their own fuse in the wiring harness or an inline fuse near the head unit.
If you can’t locate a labeled radio fuse, the owner’s manual or a dealer service manual will show the exact fuse number and location for your specific model.
Testing and replacing a blown fuse
Follow these steps to safely test and replace a blown radio fuse.
- With the vehicle off, locate the suspected fuse and remove it using a fuse puller or needle-nose pliers.
- Inspect the fuse visually; a blown fuse often shows a broken metal strand or a darkened, burnt appearance. You can also test continuity with a multimeter.
- Replace the fuse with one of the same amperage rating and type (usually blade/ATO style). Do not use a higher-amp fuse to “fix” the problem.
- Power the vehicle and test the radio. If it powers on, the issue may be resolved; if it blows again, there could be a short in the radio wiring or in the installation.
Repeated fuse blows should prompt a closer inspection of the radio wiring, any aftermarket installations, and the ignition/ACC circuit by a qualified technician.
What if there is no dedicated radio fuse?
Some vehicles do not have a separate radio fuse; the radio may be powered through the ignition/ACC circuit or via a shared fuse block. In those cases, the radio could be tied to a larger circuit or memory feed, and you may need to check the ignition/ACC fuse or a dedicated fuse near the radio harness. Aftermarket radios sometimes carry their own fuse in the wiring harness or an inline fuse near the head unit.
If your radio is still dead after checking all likely fuses, consider professional help to trace wiring, verify ignition feed behavior, and inspect for shorts or wiring faults.
Summary
The typical starting point is an interior fuse box with a label such as RADIO, RAD, or AUDIO, usually within 10–20 amps. If the fuse is not obvious, consult the owner’s manual or fuse box diagram, then inspect the relevant fuses in the interior or under-hood panels. Replace blown fuses with the correct rating and avoid bypassing with higher amperage. If fuses keep blowing, there’s likely a wiring fault or installation issue requiring professional attention.