2025 Freightliner M2 106 Fuse Box Diagram & Amperage
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
Working on this 2025 Freightliner M2 106? Run just this one job through Repairius.
No big switch. Write the estimate, text it for approval, and get paid on your phone. Keep everything else the way it is.
14-day free trial · credit card required · cancel anytime
Quick answer
On the 2025 Freightliner M2 106, you'll find the primary fuse box, known as the Power Distribution Module (PDM) or Fuse and Relay Module, located on the driver's side of the engine compartment, near the firewall. A secondary fuse and relay panel is located inside the cab, on the passenger side, behind a kick panel.
Under-Hood Fuse Box (Power Distribution Module)
The main PDM in the engine bay houses the high-amperage fuses and relays that control the truck's core systems. Always disconnect the battery before servicing these components. The cover of the PDM has a diagram to help you identify each fuse and relay, but the following table outlines the most common configuration.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 100A | Red | Main Power Feed to Cab |
| F2 | 30A | Green | Engine Control Module (ECM) |
| F3 | 20A | Yellow | Fuel Pump |
| F4 | 25A | Natural/White | Ignition Switch |
| F5 | 15A | Blue | Starter Relay |
| F6 | 20A | Yellow | Low Beam Headlights |
| F7 | 20A | Yellow | High Beam Headlights |
| F8 | 15A | Blue | Tail and Parking Lights |
| F9 | 15A | Blue | Brake Lights |
| F10 | 30A | Green | Blower Motor |
| F11 | 10A | Red | A/C Clutch |
| F12 | 30A | Green | ABS Module |
| F13 | 10A | Red | Airbag/SRS |
| F14 | 20A | Yellow | Radio/Infotainment |
| F15 | 15A | Blue | Cigar Lighter / 12V Power Outlets |
| F16 | 30A | Green | Trailer Brake Controller |
Relay Locations (Under-Hood)
- R1: Starter Relay
- R2: Ignition Relay
- R3: Fuel Pump Relay
- R4: A/C Clutch Relay
- R5: Low Beam Headlight Relay
- R6: High Beam Headlight Relay
In-Cab Fuse Box (Passenger Kick Panel)
This panel handles the lower-amperage fuses for interior and auxiliary systems. You'll need to remove the passenger-side kick panel to access it.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 10A | Red | Instrument Cluster |
| 2 | 15A | Blue | Dome Lights, Courtesy Lights |
| 3 | 10A | Red | CB Radio Power |
| 4 | 20A | Yellow | Power Windows |
| 5 | 15A | Blue | Heated Mirrors |
| 6 | 10A | Red | Diagnostic Port |
| 7 | 5A | Tan | Spare (Accessory) |
| 8 | 15A | Blue | Wiper Motor |
| 9 | 10A | Red | Turn Signals |
| 10 | 20A | Yellow | Auxiliary Power Outlets |
How to test a fuse
A blown fuse is a common and usually easy-to-fix problem. You can often tell a fuse is blown by a visual inspection. The small metal strip inside a good fuse will be intact. In a blown fuse, this strip will be broken or melted.
For a more definitive test, you can use a multimeter set to the continuity setting. With the fuse removed from the fuse box, touch one probe of the multimeter to each of the fuse's metal tabs. If the multimeter beeps or shows a reading of zero, the fuse is good. If it doesn't beep or the reading is infinite, the fuse is blown and needs to be replaced with a new one of the same amperage rating.
Common blown fuses on this vehicle
- Cigar Lighter / 12V Power Outlets: These fuses often blow due to faulty phone chargers or other plugged-in accessories. Before replacing the fuse, unplug everything from the outlets. If the new fuse blows immediately, there may be a short in the wiring.
- Trailer Lights/Brake Controller: If you're having issues with your trailer's lighting or braking systems, check these fuses first. A common cause is a short in the trailer's wiring harness.
- Fuel Pump Fuse: If your truck cranks but won't start, a blown fuel pump fuse is a possibility. If you replace the fuse and it blows again, there may be an issue with the fuel pump itself or the wiring to it.
Always verify the fuse locations and ratings with the diagram printed inside your fuse box lid, as configurations can vary based on your truck's specific options and trim level.
Find a trusted shop on Repairius.com.
Before you pull a fuse on the 2025 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 2025 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
2025 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.
Browse by make
Running an auto or diesel repair shop?
Compare Repairius to the shop software you're paying for
$99.99/month (first location included), unlimited users, 14-day free trial.