2017 Peterbilt 579 Fuse Box Diagram & Amperage
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Quick answer
The 2017 Peterbilt 579 has two main fuse box locations:
- Cab Fuse Box: Located in the main dash panel, accessible by removing the panel below the steering wheel.
- Sleeper Fuse Box (if equipped): Located in the sleeper compartment, typically behind an access panel in the lower bunk or closet area.
There is no under-hood or trunk/cargo fuse box in the traditional sense; all primary fuses are located within the cab and sleeper panels.
Cab Fuse Box (Dash Panel)
The main fuse box is located in the dash. You'll need to remove the plastic kick panel below the steering column to access it. The diagram on the back of the panel is your primary source of truth, as configurations can change based on the truck's specific options.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Blue | Marker Lamps |
| F2 | 10A | Red | Ignition/Key Wake |
| F3 | 15A | Blue | Trailer Marker Lamps |
| F4 | 10A | Red | Left Low Beam Headlight |
| F5 | 10A | Red | Right Low Beam Headlight |
| F6 | 15A | Blue | Left High Beam Headlight |
| F7 | 15A | Blue | Right High Beam Headlight |
| F8 | 30A | Green | Wiper Motor |
| F9 | 10A | Red | Blower Motor Relay Power |
| F10 | 20A | Yellow | Turn Signals/Flashers |
| F11 | 10A | Red | ABS ECU |
| F12 | 15A | Blue | Gauges/Instrument Cluster |
| F13 | 10A | Red | Engine Control Module (ECM) - Ignition |
| F14 | 30A | Green | Engine Control Module (ECM) - Battery |
| F15 | 20A | Yellow | Fuel Pump |
| F16 | 10A | Red | Park/Tail Lights |
| F17 | 15A | Blue | Brake Lights |
| F18 | 20A | Yellow | Cigar Lighter / 12V Power Port 1 |
| F19 | 20A | Yellow | Cigar Lighter / 12V Power Port 2 |
| F20 | 10A | Red | Radio/Infotainment System |
| F21 | 20A | Yellow | Airbag/SRS System |
| F22 | 10A | Red | A/C Clutch |
| F23 | 30A | Green | Trailer Brake Controller |
| F24 | 30A | Green | Blower Motor |
Relays in Cab Fuse Box:
- R1: Starter Relay
- R2: Ignition Relay
- R3: Headlight Relay
- R4: Blower Motor Relay
- R5: A/C Clutch Relay
Sleeper Fuse Box
For trucks equipped with a sleeper, this panel controls power for the amenities in the back. Its exact location can vary, but it is most often found behind a trim panel under the bunk.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| S1 | 20A | Yellow | Sleeper HVAC Blower |
| S2 | 15A | Blue | Sleeper Dome/Reading Lights |
| S3 | 20A | Yellow | Sleeper Power Port 1 (12V) |
| S4 | 20A | Yellow | Sleeper Power Port 2 (12V) |
| S5 | 15A | Blue | Refrigerator |
| S6 | 10A | Red | TV/Entertainment Power |
| S7 | 15A | Blue | Auxiliary Heater |
How to test a fuse
Testing a fuse is a simple process. First, locate the suspect fuse and remove it from its slot—a fuse puller tool is recommended to avoid damage. Hold the fuse up to the light. Inside the plastic body is a thin metal strip. If that strip is broken or looks burnt, the fuse is blown and needs to be replaced.
For an opaque or hard-to-see fuse, you can use a multimeter set to continuity. Touch the probes to each metal tab on the top of the fuse. If the multimeter beeps, the fuse is good. If it remains silent, the fuse is blown.
Always replace a blown fuse with one of the exact same amperage rating. Using a higher-amp fuse can cause a fire by allowing a circuit to overheat.
Common blown fuses on this vehicle
-
Cigar Lighter / 12V Power Port (F18, F19): This is one of the most common blown fuses on any vehicle. It's often caused by a faulty phone charger, a coin falling into the socket, or plugging in a device that draws too much power. Before replacing the fuse, inspect the socket for any foreign objects.
-
Trailer Lights (F3, F17): If your truck's lights work but your trailer lights don't, check these fuses first. The issue is frequently caused by a bad connection at the trailer plug or a wiring short on the trailer itself. Inspect the 7-pin connector for corrosion or bent pins, and check the trailer wiring for any frays or damage before replacing the fuse.
-
Blower Motor (F24): If your main cabin fan stops working, this fuse is the first place to look. If the fuse is blown, it could be a sign that the blower motor itself is failing and drawing too much current. If you replace the fuse and it blows again immediately or soon after, the blower motor or its resistor likely needs to be replaced.
Disclaimer: Fuse locations and amperage can vary based on the specific trim and options of your vehicle. Always confirm by checking the diagram printed on the fuse box lid or in your owner's manual. If you are unsure about any electrical repair, consult a professional.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2017 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 2017 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
2017 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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