The 1990 Jeep Wrangler TJ fuse box is located under the dashboard on the driver’s side.
Where is Jeep fuse box?
The “Jeep fuse box” isn’t a single unit; the 1990 Wrangler TJ has fuse panels tucked under the hood and inside the cab.
Under the hood, you’ll spot two fuse boxes: one bolted to the driver-side firewall and another near the battery on the passenger side. Inside the cab, there’s a smaller panel hiding below the steering column. (Always disconnect the negative battery cable before poking around any fuse box.)
Where is the fuse box located?
On a 1990 Jeep Wrangler TJ, the fuse box shows up in three spots: under the dashboard on the driver’s side and in two places up front under the hood.
One panel hides below the steering wheel inside the cab, while two more boxes lurk in the engine bay. The under-hood boxes go by “Power Distribution Center” and “Fuse & Relay Box.” If you’re scratching your head over which box controls what, peek at the legend on the inside cover or flip through your owner’s manual.
Where is the fuse box under the hood?
The main under-hood fuse box on a 1990 Jeep Wrangler TJ sits on the driver’s side firewall; the secondary box clings to the battery tray on the passenger side.
Each box uses spring-loaded catches on two sides—press both at once and lift the lid. The firewall box handles high-amperage circuits like the starter, alternator, and radiator fan. Keep a 10 mm socket or flat-blade screwdriver nearby to loosen the grounding strap on the battery-side box.
Is there a fuse box inside?
Yep, there’s a fuse box inside the cab on the 1990 Jeep Wrangler TJ, tucked below the steering column on the driver’s side.
This panel guards convenience circuits like the radio, interior lights, and power windows. The cover pops off by hand—no tools needed. Want to wire in an aftermarket stereo or extra lights? You can tap into this panel for switched 12 V power, but don’t go over the fuse rating shown on the legend.
How much does it cost to replace a fuse box?
Replacing a 1990 Jeep Wrangler TJ fuse box usually runs $150–$400 for the part plus $100–$150 for labor.
| Component | Part Number | Price Range (2026) |
|---|
| Passenger-side firewall box | 6826912 | $90–$140 |
| Battery-tray box | 6826911 | $60–$90 |
| Driver-side dash box | 6824289 | $40–$70 |
| Labor (independent shop) | — | $100–$150 |
Prices swing wildly depending on your region and year; OEM Mopar boxes are still the safest bet. Tackling it yourself? Set aside about 30–45 minutes and a basic toolkit.
How do you fix a fuse box?
You don’t “fix” a fuse box—swap blown fuses or clean up minor corrosion; never try to repair the plastic housing or internal bussing.
- Kill the ignition and pop the negative battery cable to stay safe.
- Open the right fuse panel and hunt down the blown fuse using the legend.
- Slide in a fresh fuse with the exact same rating (usually 10–30 A).
- Reconnect the battery, power up the circuit, and confirm it’s working.
Spotted corrosion on the terminals? Scrub them with a fiberglass brush and slather on some dielectric grease. If the box itself is cracked or melted, it’s time for a full replacement.
How do you take apart a fuse box?
To crack open a 1990 Jeep fuse box, start by disconnecting the battery, then unlatch the cover, tag and pull each wiring harness plug, and finally undo the mounting screws or clips.
- Disconnect the negative battery cable and tuck the positive terminal out of the way.
- Press the two side clips on the cover and lift it off; stash any set screws in a safe spot.
- Label every multi-pin connector with masking tape before yanking them free; a flat-blade screwdriver helps pry them loose.
- Remove the two 8 mm mounting screws (firewall box) or 10 mm nuts (battery-tray box) and slide the box out.
Is a fuse box the same as a circuit breaker?
A fuse box relies on replaceable fuses, while a circuit breaker panel uses toggle switches that pop back after an overload.
Fuses are one-shot deals—metal filaments that vaporize when overloaded—whereas breakers are mechanical and reset automatically. The 1990 Jeep sticks with fused circuits, so expect to swap fuses, not flip breakers.
Why has my fuse box tripped?
A fuse “trips” when its circuit gets slammed with too much current or shorts out; the fuse element melts and cuts the power.
Usual suspects include a jammed electric cooling fan, a fried power-window wiring harness, or a corroded trailer-wiring connector. Unplug accessories one by one, scan wires for melted insulation, and check for aftermarket gadgets hogging too much juice. Always replace the fuse with the exact same amperage to keep the wiring safe.
