2018 Freightliner M2 106 Fuse Box Diagram & Amperage
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Quick answer
The 2018 Freightliner M2 106 has two main fuse box locations:
- Under-hood: Located on the driver's side of the engine compartment, near the firewall.
- Dash kick-panel: Located on the passenger side, behind a trim panel in the footwell.
Under-hood Fuse Box
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 30A | Green | ECM |
| F2 | 20A | Yellow | Fuel Pump |
| F3 | 15A | Blue | Ignition Coils |
| F4 | 10A | Red | Starter Relay |
| F5 | 15A | Blue | Headlights (Low Beam) |
| F6 | 15A | Blue | Headlights (High Beam) |
| F7 | 10A | Red | Tail/Park Lights |
| F8 | 15A | Blue | Brake Lights |
| F9 | 30A | Green | Blower Motor |
| F10 | 10A | Red | A/C Clutch |
| F11 | 20A | Yellow | ABS |
| F12 | 10A | Red | Airbag |
| F13 | 15A | Blue | Radio/Infotainment |
| F14 | 20A | Yellow | Cigar/12V Outlets |
| F15 | 30A | Green | Trailer Brake Controller |
| R1 | - | - | ECM Relay |
| R2 | - | - | Fuel Pump Relay |
| R3 | - | - | Ignition Relay |
| R4 | - | - | Starter Relay |
Dash Kick-Panel Fuse Box
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Instrument Cluster |
| F2 | 15A | Blue | Power Windows |
| F3 | 10A | Red | Door Locks |
| F4 | 15A | Blue | Interior Lights |
| F5 | 10A | Red | Horn |
| F6 | 15A | Blue | Wipers |
| F7 | 10A | Red | Turn Signals |
| F8 | 15A | Blue | Hazard Lights |
| F9 | 10A | Red | Backup Lights |
| F10 | 15A | Blue | Mirror Heaters |
How to test a fuse
- Turn off the ignition and all accessories.
- Locate the fuse box and remove the cover.
- Identify the suspect fuse and remove it with a fuse puller or needle-nose pliers.
- Hold the fuse up to the light and look for a break in the metal strip. If the strip is broken, the fuse is blown and needs to be replaced.
- Alternatively, you can use a multimeter to test the fuse for continuity. Set the multimeter to the continuity setting and touch the probes to the two metal tabs on the fuse. If the multimeter beeps or shows a reading of 0, the fuse is good. If it doesn't beep or shows a reading of infinity, the fuse is blown.
Common blown fuses on this vehicle
- ECM/PCM fuse: This fuse can blow due to a short in the wiring or a faulty sensor. If this fuse blows, the engine will not start.
- Fuel pump fuse: This fuse can blow due to a clogged fuel filter or a failing fuel pump. If this fuse blows, the engine will crank but will not start.
- Ignition fuse: This fuse can blow due to a problem with the ignition switch or a short in the wiring. If this fuse blows, the engine will not crank.
- Trailer brake fuse: This fuse can blow due to a short in the trailer wiring or a problem with the trailer brake controller. If this fuse blows, the trailer brakes will not work.
Disclaimer: The fuse numbers and locations in this article are for informational purposes only. Always consult the owner's manual or the fuse box diagram in your vehicle for the most accurate information.
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Before you pull a fuse on the 2018 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 2018 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
2018 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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