2014 Freightliner M2 106 Fuse Box Diagram & Amperage
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Quick answer
On a 2014 Freightliner M2 106, you will find two primary fuse box locations:
- Under-hood Power Distribution Module (PDM): Located on the driver's side of the engine compartment, near the firewall.
- Interior Fuse Block: Located inside the cab, typically behind a panel on the passenger-side dashboard or in the kick-panel.
Under-hood Power Distribution Module (PDM)
This fuse box contains high-amperage fuses and relays for major vehicle systems. The cover of the PDM has a diagram to help you identify each component. Always disconnect the battery before servicing high-amperage fuses.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 125A | Mega | Cab Power |
| F2 | 125A | Mega | Starter |
| F3 | 100A | Mega | Engine Control Module (ECM) |
| F4 | 60A | Maxi | Ignition Switch |
| F5 | 40A | Maxi | ABS Power |
| F6 | 30A | Maxi | Fuel Pump |
| F7 | 30A | Maxi | A/C Clutch |
| F8 | 20A | Trailer Lights | |
| R1 | - | - | Starter Relay |
| R2 | - | - | Ignition Relay |
| R3 | - | - | Fuel Pump Relay |
| R4 | - | - | A/C Clutch Relay |
Interior Fuse Block
This fuse block handles the fuses for interior and accessory circuits. The layout can vary slightly depending on the truck's specific configuration and options. Always check the diagram on the fuse panel cover to confirm.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 20A | Yellow | Cigar Lighter / 12V Power Outlet |
| 2 | 10A | Red | Radio / Infotainment |
| 3 | 15A | Blue | Blower Motor |
| 4 | 10A | Red | Headlight (Low Beam, Left) |
| 5 | 10A | Red | Headlight (Low Beam, Right) |
| 6 | 15A | Blue | Headlight (High Beam, Left) |
| 7 | 15A | Blue | Headlight (High Beam, Right) |
| 8 | 10A | Red | Tail / Park Lights |
| 9 | 15A | Blue | Brake Lights |
| 10 | 10A | Red | Airbag System |
| 11 | 15A | Blue | ABS Control Unit |
| 12 | 20A | Yellow | Trailer Brake Control |
| 13 | 10A | Red | Ignition Coils |
| 14 | 15A | Blue | Cabin Fuse Panel Power |
How to test a fuse
A blown fuse is a common and usually easy-to-fix problem. Here's how to test one:
- Turn off the ignition and all electrical accessories.
- Locate the fuse box and remove the cover.
- Identify the suspect fuse. The fuse diagram on the cover should help.
- Remove the fuse. You can use the fuse puller tool often found in the fuse box, or a pair of needle-nose pliers.
- Inspect the fuse. Look at the metal strip inside the plastic housing. If the strip is broken or melted, the fuse is blown.
- Use a multimeter (optional but recommended). For a more accurate test, set your multimeter to the continuity setting. Touch the probes to each of the fuse's metal tabs. If the multimeter beeps or shows a reading of near-zero ohms, the fuse is good. If it doesn't beep or shows "OL" (overload), the fuse is blown.
Common blown fuses on this vehicle
- Cigar Lighter / 12V Power Outlet Fuse: This is one of the most common fuses to blow, often due to a faulty phone charger or other plug-in accessory. If this fuse blows, check the device you plugged in for any damage before replacing the fuse.
- Trailer Lights Fuse: If you frequently tow, issues with trailer wiring (shorts, corrosion) can cause this fuse to blow. If the fuse blows instantly when you connect the trailer, the problem is most likely in the trailer's wiring. Start by inspecting the trailer plug and wiring for any obvious damage.
- Fuel Pump Fuse: If your truck cranks but won't start, a blown fuel pump fuse could be the culprit. If you replace the fuse and it blows again, this could indicate a problem with the fuel pump itself or the wiring to it, which will require further diagnosis.
Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-rated fuse can cause serious damage to the electrical system and create a fire hazard.
The fuse numbers and positions provided here are for the most common configuration of the 2014 Freightliner M2 106. Always verify with the printed legend on your vehicle's fuse box lid, as trim levels and optional equipment can cause variations.
Find a trusted shop on Repairius
If you're not comfortable diagnosing an electrical issue yourself, or if a fuse continues to blow after being replaced, it's time to consult a professional. Repairius.com has a network of ASE-certified technicians who can diagnose and repair any electrical problem on your Freightliner. Find a trusted shop in your area today.
Before you pull a fuse on the 2014 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 2014 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
2014 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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