Chevrolet S10 Fuse Box: Location & Guide
TL;DR
Two fuse boxes on the S10: one under the hood, one inside the cabin near the steering column, each labeled on its own lid diagram.
Where the Chevrolet S10 fuse boxes are located
Across the North American and South American generations of the S10, the electrical system is split into two main fuse/relay boxes. The engine compartment box sits at the back or side of the engine bay, typically close to the battery or the brake booster, and protects high-draw circuits such as the fuel pump relay, engine cooling fan, ABS module, and headlights. The interior (passenger compartment) box is mounted under the dashboard, almost always on the driver's side near the door or below the steering column, and is reached by unclipping or unscrewing a plastic access panel. Some later Brazilian-built S10 generations also route a few accessory circuits (trailer wiring, auxiliary lighting) through a smaller add-on fuse holder near the same area, so check the lid diagram for your specific unit before assuming a fuse position.
Fuse box locations by generation
| Generation / years | Fuse box | Location | How to access |
|---|---|---|---|
| First generation (North America, roughly late 1970s-early 1990s) | Engine bay box | Driver-side inner fender or firewall area near the battery | Lift or unclip the plastic lid; legend is printed on the underside |
| First generation (North America) | Interior box | Under the dash, left of the steering column | Pull down or unscrew the lower dash panel to expose the box |
| Second generation (Brazil/LatAm-built, roughly 1995-2011) | Engine bay box | Near the brake booster or battery, driver or passenger side depending on cab/engine option | Unclip the lid tabs by hand, no tools usually needed |
| Second generation (Brazil/LatAm-built) | Interior box | Below the dash near the driver's door, sometimes behind a small trim cover | Remove or swing open the trim cover; some require a flat trim tool |
| Third generation / current (2012-present, Brazil/LatAm and export markets) | Engine bay box | Front of the engine bay, driver side, close to the battery | Squeeze the lid release tabs and lift straight up |
| Third generation / current (2012-present) | Interior box | Driver's side of the dash, left of the steering wheel, behind a small cover panel | Pull the cover panel outward from the top edge; it is held by plastic clips |
Where to find the official fuse legend
Every fuse box lid or cover has a printed diagram molded or stickered onto its underside listing each fuse or relay position by circuit. This diagram is the authoritative source for exact amperage and position on your specific truck, since these details vary by model year, engine, and trim. The owner's manual also has a dedicated electrical section that reproduces the same diagram in more readable form, along with a fuse-puller tool that usually clips into the interior box itself.
Fuses that most commonly blow, by function
- Cigarette lighter / 12V accessory outlet - blows when an aftermarket device (inverter, air compressor, phone charger) draws too much current or has a shorted plug; symptom is simply a dead outlet with everything else working normally.
- Radio / infotainment - a blown fuse here kills the screen, speakers, and sometimes the dash clock; often triggered by an aftermarket stereo installation with a pinched wire.
- Interior lighting - dome light, map lights, and glovebox light typically share one fuse; if none of them work but everything else is fine, this is the first fuse to check.
- Blower motor (HVAC fan) - a blown fuse here means no air movement at any fan speed; if the fan works on some speeds but not others, the problem is usually the blower resistor, not the fuse.
- Fuel pump relay circuit - if this fuse blows the truck will crank but not start, or stall right after starting, because the pump loses power; this circuit is also the one most likely to reveal a wiring short if it blows repeatedly.
How to check and replace a fuse safely
Pull the suspect fuse straight out with the plastic fuse-puller clipped inside the box, or with needle-nose pliers if no puller is present. Hold it up to the light: a good fuse has an intact thin metal strip between its two prongs, while a blown one shows a visibly broken or scorched strip. If it looks fine but you are unsure, a simple 12V test light or multimeter across the two prongs with the circuit powered will confirm continuity. Always replace a fuse with one of the exact same amperage - stamped on top of the fuse body and listed on the lid diagram - never a higher rating, since that removes the protection the fuse is meant to provide and can lead to melted wiring.
When a blown fuse means a bigger problem
A fuse that blows once, right after you plugged in a new accessory, is usually just an overload and a simple swap fixes it. A fuse that blows again immediately after replacement, or blows repeatedly with no accessory involved, points to a short circuit somewhere in that wiring branch - chafed insulation, a pinched harness, or a failed component drawing excess current. In these cases, pulling stored diagnostic trouble codes with a code reader is the fastest way to narrow down which module or circuit is at fault before you start chasing wires blind, since many electrical shorts also set a related fault code in the affected module.
Summary
| Engine bay fuse box location | Near battery or brake booster, driver or passenger side (varies by generation) |
|---|---|
| Interior fuse box location | Under dash, driver's side, near steering column |
| Legend source | Printed diagram on the inside of each fuse box lid, plus owner's manual electrical section |
| Most commonly blown fuse | 12V accessory outlet / cigarette lighter (aftermarket device overload) |
| Replacement rule | Match the exact amperage stamped on the old fuse - never go higher |
| Repeat-blow warning sign | Fuse blows again immediately after replacement - indicates a short, not overload |
| Diagnostic tip | Pull stored fault codes with a code reader before chasing wiring on repeat failures |
Full diagnostics
For the complete step-by-step diagnostic and repair guide, see Chevrolet S10: Common Problems, Fault Codes & Repairs.
Frequently asked questions
Where is the fuse box on a Chevrolet S10?
Every Chevrolet S10 has two fuse boxes: one in the engine bay near the battery or brake booster (driver or passenger side depending on year), and one inside the cabin under the dash on the driver's side, usually behind a small clip-on or screw-on panel near the steering column. The exact position shifts slightly across generations, so the printed diagram on the inside of each box's lid is the most reliable way to confirm it for your truck.
Why does the 12V outlet or cigarette lighter fuse keep blowing?
It almost always means something plugged into that outlet - an inverter, air pump, or phone charger - is drawing more current than the circuit allows, or has an internal short. Unplug all accessories, replace the fuse with one of the same amperage, and test with nothing plugged in; if it blows again immediately with nothing connected, there is a wiring short that needs to be traced rather than just re-fused.
How do I know if a fuse is blown without pulling it apart?
Pull the fuse out and hold it up to a light source: a good fuse shows an unbroken thin metal strip connecting its two prongs, while a blown one shows a visibly broken, melted, or scorched strip. If it still looks intact but the circuit isn't working, use a 12V test light or multimeter on the two prongs with the key on to confirm whether current is actually passing through.
Can I use a higher-amperage fuse if the correct one keeps blowing?
No - always replace a fuse with the exact same amperage rating shown on the fuse body and on the box lid diagram. Installing a higher-rated fuse removes the protection that circuit is designed to have, and a fuse that keeps blowing at the correct rating means there is an underlying short or overload that needs to be diagnosed, not bypassed.