2018 Jeep Wrangler Fuse Box Diagram & Amperage
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Quick answer
The 2018 Jeep Wrangler (JL) has two main fuse box locations:
- Under-hood fuse box (Power Distribution Center): Located in the engine bay, near the battery on the passenger side.
- Interior fuse box: Located in the passenger footwell, behind a small access panel.
Under-hood Fuse Box (Power Distribution Center)
This is the primary fuse box and contains higher amperage fuses and relays for major vehicle systems. The layout can vary slightly based on your vehicle's options (e.g., engine type, tow package).
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F12 | 25A | Natural | Audio Amplifier |
| F13 | 40A | Green | ABS Pump |
| F17 | 40A | Green | Blower Motor |
| F22 | 20A | Yellow | Trailer Tow Connector |
| F23 | 20A | Yellow | Cigar Lighter / 12V Power Outlet |
| F34 | 10A | Red | A/C Clutch |
| F38 | 15A | Blue | Fuel Pump |
| F42 | 25A | Natural | Powertrain Control Module (PCM) / Engine Control Module (ECM) |
| F51 | 15A | Blue | Left High-Beam Headlamp |
| F52 | 15A | Blue | Right High-Beam Headlamp |
| F53 | 15A | Blue | Right Low-Beam Headlamp |
| F54 | 15A | Blue | Left Low-Beam Headlamp |
Common Relays in this location:
- Starter Relay: Engages the starter motor.
- Fuel Pump Relay: Powers the fuel pump.
- A/C Clutch Relay: Engages the air conditioning compressor.
- Blower Motor Relay: Controls the HVAC fan speed.
Interior Fuse Box (Passenger Footwell)
This fuse box handles most of the interior and lower-amperage circuits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F61 | 20A | Yellow | Radio / Infotainment System |
| F62 | 10A | Red | Airbag Module / Occupant Classification System |
| F70 | 10A | Red | Ignition Coils |
| F77 | 15A | Blue | Brake Lights (Stop Lamps) |
| F81 | 20A | Yellow | Rear Window Defroster |
| F88 | 10A | Red | Tail and Park Lights |
| F90 | 25A | Natural | Cabin Fuse / Power Outlet |
Note: Always verify these fuse numbers and locations with the diagram printed on the inside of your fuse box cover, as configurations can differ based on trim and options.
How to test a fuse
Testing a fuse is a simple process. You can often tell if a fuse is blown by a quick visual inspection. Most automotive fuses are the "blade" type and have a small metal link visible through a clear plastic top. If this link is broken, the fuse is blown. For a more definitive test, you can use a multimeter set to continuity. With the fuse removed from the fuse box, touch the multimeter probes to each of the two metal blades on the fuse. If the multimeter beeps or shows a reading of zero ohms, the fuse is good. If it shows "OL" or no reading, the fuse is blown and needs to be replaced with one of the same amperage rating.
Common blown fuses on this vehicle
- Cigar Lighter / 12V Power Outlet Fuse: This is one of the most commonly blown fuses. It often blows when a faulty phone charger or other accessory is plugged in. If this fuse blows, check the device you last plugged in for any signs of damage before replacing the fuse.
- Radio / Infotainment Fuse: If your radio or Uconnect screen suddenly goes black, the fuse is the first thing to check. This can sometimes happen due to a software glitch or an internal fault in the radio unit.
- Trailer Tow Connector Fuse: If you are towing a trailer and the trailer lights are not working, check this fuse. A common cause is a short in the trailer wiring.
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Before you pull a fuse on the 2018 Jeep Wrangler
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2018 Jeep Wrangler
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Jeep Wrangler Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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