2024 Peterbilt 579 Fuse Box Diagram & Amperage
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Quick answer
The 2024 Peterbilt 579 typically has fuse boxes located in the following areas:
- Under-hood: On the passenger side, near the firewall.
- Dash Kick-Panel: On the passenger side, behind a removable panel.
- Rear Cab (Sleeper): In the rear wall or overhead console of the sleeper compartment (if equipped).
Under-Hood Fuse Box
The under-hood fuse box on your 2024 Peterbilt 579 is primarily responsible for protecting critical engine and chassis components, as well as high-current circuits. It's usually located on the passenger side of the engine compartment, often near the firewall or battery box. Always refer to the fuse diagram printed on the inside of the fuse box cover for the most accurate information for your specific truck's configuration.
Common Under-Hood Fuse and Relay Locations:
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | ECM/PCM (Engine Control Module/Powertrain Control Module) |
| F2 | 10A | Red | Ignition Switch Circuit |
| F3 | 30A | Green | Fuel Pump Relay Feed |
| F4 | 20A | Yellow | ABS (Anti-lock Braking System) |
| F5 | 15A | Blue | Headlights Low Beam (Left) |
| F6 | 15A | Blue | Headlights Low Beam (Right) |
| F7 | 15A | Blue | Headlights High Beam (Left) |
| F8 | 15A | Blue | Headlights High Beam (Right) |
| F9 | 20A | Yellow | Starter Solenoid |
| F10 | 10A | Red | Cabin Fuse Box Feed |
| R1 | Fuel Pump Relay | ||
| R2 | Starter Relay | ||
| R3 | Headlight Relay |
Note: Fuse numbers and amperages may vary slightly depending on specific trim levels and optional equipment. Always consult your owner's manual and the fuse box lid diagram.
Dash Kick-Panel Fuse Box (Passenger Side)
This fuse box, often located behind a removable panel on the passenger side kick-panel, houses fuses for many of the truck's interior electrical systems, accessories, and some driver assistance features. Accessing it usually involves removing a few screws.
Common Dash Kick-Panel Fuse Locations:
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | Blower Motor |
| F2 | 10A | Red | Radio / Infotainment System |
| F3 | 15A | Blue | Cigar Lighter / 12V Outlet (Dash) |
| F4 | 10A | Red | A/C Clutch |
| F5 | 5A | Tan | Instrument Cluster |
| F6 | 10A | Red | Brake Lights |
| F7 | 15A | Blue | Tail Lights / Park Lights |
| F8 | 10A | Red | Wipers |
| F9 | 10A | Red | Turn Signals / Hazard Lights |
| F10 | 10A | Red | Power Windows |
| R1 | Blower Motor Relay | ||
| R2 | Accessory Delay Relay |
Note: The exact layout and amperage ratings can differ. Always verify with your truck's specific documentation.
Rear Cab Fuse Box (Sleeper Compartment)
For 2024 Peterbilt 579 models equipped with a sleeper, there's typically an additional fuse box located in the rear cab. This box often manages power for sleeper amenities such as interior lighting, refrigeration, power outlets, and potentially trailer-related functions.
Common Rear Cab Fuse Locations:
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | Sleeper Interior Lights |
| F2 | 15A | Blue | 12V Outlet (Sleeper) |
| F3 | 15A | Blue | Refrigerator Power (if equipped) |
| F4 | 30A | Green | Trailer Brake Controller (if equipped) |
| F5 | 10A | Red | Auxiliary Heater |
| F6 | 10A | Red | Power Inverter (Low Current) |
Note: Sleeper configurations vary widely. Always check the legend inside your sleeper fuse box cover.
How to Test a Fuse
Testing a fuse is a straightforward process that can help you diagnose electrical issues. Here's a common method:
- Locate the Fuse: Identify the suspect fuse using the diagrams above and your truck's fuse box legend.
- Visual Inspection: Many fuses have a visible wire element inside. If this wire is broken or melted, the fuse is blown. Some fuses have a small LED that illuminates when blown.
- Using a Fuse Tester (Recommended): A fuse tester is an inexpensive tool that makes testing easy. With the ignition off, touch the tester's probes to the two small metal test points on the top of the fuse. If the tester lights up on both sides, the fuse is good. If it only lights up on one side or not at all, the fuse is blown.
- Using a Multimeter: Set your multimeter to measure continuity (Ω or the continuity symbol). Remove the fuse from its slot. Touch one probe to each metal blade of the fuse. A good fuse will show a reading close to zero ohms or beep (indicating continuity). A blown fuse will show an
Before you pull a fuse on the 2024 Peterbilt 579
- 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.
- Many heavy trucks have more than one power distribution point (cab, under-hood or near the batteries), and some circuits use circuit breakers instead of fuses. Some systems have 24-volt starting circuits; confirm the voltage before testing.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work · Find mobile truck repair
More specs for the 2024 Peterbilt 579
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
2024 Peterbilt 579 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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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-26.