2021 Jeep Wrangler Fuse Box Diagram & Amperage Guide

Quick Answer

The 2021 Jeep Wrangler typically has three main fuse box locations: one under the hood, one in the passenger side kick panel (behind the glove box), and one in the cargo area (rear passenger side).

Under-Hood Fuse Box (Power Distribution Center - PDC)

This fuse box is located in the engine compartment, usually on the driver's side, near the battery. It contains high-current fuses and relays for major electrical components. Always verify the printed legend on the fuse box lid, as configurations can vary slightly by trim level and options.

Relays in Under-Hood Fuse Box:

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: HVAC Blower Motor Relay (Front)
• R4: A/C Clutch Relay
• R5: Radiator Fan Relay
• R6: Horn Relay
• R7: Run/Accessory Relay
• R8: Headlight Low Beam Relay
• R9: Headlight High Beam Relay
• R10: Powertrain Control Module (PCM) Main Relay

Passenger Side Kick Panel Fuse Box (Junction Block)

This fuse box is located behind the glove box, accessing it requires removing the glove box assembly. It handles many of the interior electrical components. Always cross-reference with your vehicle's specific fuse diagram, as slight variations can occur.

Cargo Area Fuse Box (Rear Passenger Side)

This fuse box is typically located on the rear passenger side of the cargo area, often behind a removable panel or near the subwoofer if equipped. It provides power to rear accessories and power outlets.

How to Test a Fuse

1. Locate the Fuse: Identify the suspect fuse using the appropriate fuse box diagram for your 2021 Jeep Wrangler. Consult the legend on the fuse box cover first, as this is the most accurate source of information for your specific vehicle.
2. Visual Inspection: Most fuses are transparent, allowing for a quick visual check. Look for a broken wire or a melted appearance within the fuse. If it's blown, the internal metal strip will be visibly broken.
3. Use a Fuse Tester or Multimeter: For non-transparent fuses or a more accurate diagnosis, use a fuse tester or a multimeter. With the ignition off, touch the probes of the tester to the two test points on top of the fuse. If the fuse is good, the tester will light up or the multimeter will show continuity (a reading of nearly zero ohms).
4. Replace if Blown: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Using a fuse with a higher amperage can cause severe electrical damage or fire, while a lower amperage fuse will likely blow again immediately.

Common Blown Fuses on This Vehicle

While fuse issues can occur in any circuit, some fuses are more commonly reported to blow due to regular wear or specific component demands. If you experience a sudden electrical problem, start by checking these fuses:

• Cigar Lighter/12V Power Outlets (F50, F67, F80): These fuses are frequent culprits due to overloading from charging devices, faulty accessories, or foreign objects inserted into the outlets. If an outlet isn't working, check these first.
• Radio/Infotainment System (F51): Problems with aftermarket stereo installations, short circuits in wiring, or even a faulty head unit can cause this fuse to blow. If your radio is dead, this is a good place to start troubleshooting.
• Blower Motor (Front) (F05): A failing blower motor, a clogged cabin air filter causing the motor to work harder, or an issue with the blower motor resistor can lead to this fuse blowing. If your fan isn't working on any speed, check this fuse.
• Trailer Tow Fuses (F14, F83, F84, F85): Issues with trailer wiring, short circuits in the trailer-side harness, or a problem with the trailer brake controller can cause these fuses to blow. If you have trailer light or brake issues, review these fuses.
• Headlights (F09, F10, F11, F12): While less common, a short in the headlight wiring or a faulty bulb (especially with aftermarket HID/LED conversions) can cause a headlight fuse to blow. If one or both headlights are out, check the respective fuses.

Always check the component first for any obvious issues (e.g., a visibly broken bulb, a stuck object in the power outlet, a loose trailer wire) before replacing a fuse. If a new fuse blows immediately, there's a short circuit or an underlying electrical fault that needs professional diagnosis.

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