2024 Freightliner M2 106 Fuse Box Diagram & Amperage
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Quick answer
The 2024 Freightliner M2 106 features one primary fuse and relay center, known as the Power Distribution Module (PDM) or simply the fuse box. It is a consolidated unit that houses both fuses and relays, eliminating the need for multiple fuse boxes scattered throughout the vehicle.
- Main Fuse Box / Power Distribution Module (PDM): Located on the driver's side, under the hood. It is a large, black box mounted on the firewall, close to the steering column assembly.
Important Note: Fuse and relay arrangements can vary based on the truck's specific configuration, engine (Cummins or Detroit), and optional equipment. Always confirm fuse locations and ratings by checking the printed diagram on the inside of your fuse box lid. The information below represents a common configuration.
Main Fuse Box / Power Distribution Module (Under Hood)
This central unit contains the majority of the fuses and relays critical to the truck's operation.
Fuses
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Ignition, Key Switch |
| F2 | 20A | Yellow | ECM / PCM (Engine Control Module) |
| F3 | 15A | Blue | Fuel Pump |
| F4 | 30A | Green | Blower Motor (HVAC Fan) |
| F5 | 10A | Red | A/C Clutch |
| F6 | 15A | Blue | Low Beam Headlights (Left & Right) |
| F7 | 15A | Blue | High Beam Headlights (Left & Right) |
| F8 | 15A | Blue | Park & Tail Lights |
| F9 | 20A | Yellow | Brake Lights (Stop Lamps) |
| F10 | 20A | Yellow | Cigar Lighter / 12V Power Outlets |
| F11 | 30A | Green | ABS Module Power |
| F12 | 10A | Red | Airbag / SRS Control Unit |
| F13 | 20A | Yellow | Radio / Infotainment System |
| F14 | 30A | Green | Trailer Brake Controller Power |
| F15 | 10A | Red | Cabin/Dome Lights |
| F16 | 25A | Natural | Ignition Main Feed |
Relays
| Relay # | Type | Circuit / Component Controlled |
|---|---|---|
| R1 | 4-Pin | Starter Relay |
| R2 | 4-Pin | Ignition Main Relay |
| R3 | 4-Pin | Fuel Pump Relay |
| R4 | 4-Pin | A/C Clutch Relay |
| R5 | 4-Pin | Blower Motor Relay |
| R6 | 5-Pin | Low/High Beam Headlight Relay |
| R7 | 4-Pin | Trailer Marker Lights Relay |
How to test a fuse
If a component like your headlights or radio stops working, a blown fuse is a likely culprit. Testing a fuse is simple:
- Turn off the ignition and the component that isn't working.
- Locate the fuse box (under the hood in this case) and remove the cover.
- Find the suspect fuse using the diagram on the cover or in this guide.
- Remove the fuse using the fuse puller tool often found inside the fuse box. If not, small pliers will work.
- Visually inspect the fuse. Look at the thin metal strip inside the plastic housing. If this strip is broken or appears melted, the fuse is blown.
- Confirm with a multimeter (optional but recommended). Set your multimeter to the continuity setting (it looks like a sound wave symbol). Touch the probes to each of the two metal blades on the fuse. If the meter beeps, the fuse is good. If it remains silent, the fuse is blown.
- Replace the blown fuse with a new one of the exact same amperage rating. Using a higher amp fuse can cause severe damage to the vehicle's wiring and is a fire hazard.
Common blown fuses on this vehicle
-
Fuse F10 (Cigar Lighter / 12V Power Outlets): This is one of the most commonly blown fuses. It often happens when a faulty phone charger or other plugged-in device creates a short. Before replacing the fuse, unplug all devices from the 12V outlets to see if the problem clears.
-
Fuse F14 (Trailer Brake Controller Power): Issues with trailer wiring are a frequent cause for this fuse to blow. A short in the trailer's light or brake wiring will protect the truck by blowing this fuse. The first thing to check is the 7-pin trailer connection for corrosion or damage, and then inspect the trailer wiring itself.
-
Fuse F4 (Blower Motor): If your HVAC fan suddenly stops working on all speeds, this fuse is the first place to look. If the fuse is blown, it could be due to an aging blower motor drawing too much current. If the new fuse blows immediately, you likely have a short in the wiring or a seized motor that needs to be replaced.
When you need professional help with diagnosing electrical issues or any other repair, use Repairius to find a qualified and trusted shop in your area.
Before you pull a fuse on the 2024 Freightliner M2 106
- 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 Freightliner M2 106
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 Freightliner M2 106 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 2026-08-25.