2019 Freightliner M2 106 Fuse Box Diagram & Amperage

Quick Answer

The 2019 Freightliner M2 106 typically has fuse boxes located in the following areas:

• Under-hood: Main fuse and relay panel, often located on the driver's side, near the firewall.
• Interior (Dash Kick-Panel): Typically on the passenger side, behind a removable panel.

Under-Hood Fuse Box

The under-hood fuse box contains many of the primary fuses and relays for critical engine functions, lighting, and other high-current circuits. Always refer to the legend on your fuse box cover for the most accurate information, as configurations can vary slightly due to vehicle options and trim levels.

Common Relays in this Box:

• RL1: Fuel Pump Relay
• RL2: Starter Relay
• RL3: Headlight Relay (Low Beam)
• RL4: Headlight Relay (High Beam)
• RL5: Blower Motor Relay
• RL6: A/C Clutch Relay
• RL7: ABS Module Relay

Interior (Dash Kick-Panel) Fuse Box

The interior fuse box generally manages accessories, cabin lighting, radio, and other non-engine essential components. This panel is typically located behind a removable access panel on the passenger side kick-panel.

Common Relays in this Box:

• RL1: Accessory Relay
• RL2: Power Window Relay

How to Test a Fuse

Testing a fuse is a straightforward process that can save you a trip to the mechanic. Here's how:

1. Safety First: Ensure the vehicle is off and the key is removed from the ignition before you begin.
2. Locate the Fuse: Find the fuse box corresponding to the circuit you suspect has a problem. Use the diagram on the fuse box cover or in your owner's manual to identify the correct fuse.
3. Visual Inspection: Many fuses have a clear plastic body. Look for a broken or burnt wire inside. If it's broken, the fuse is blown and needs replacement.
4. Use a Fuse Tester or Multimeter: For fuses that aren't visually obvious (or for a more reliable test), use a fuse tester or multimeter:
   • Fuse Tester: These inexpensive tools light up to indicate if a fuse is good. Simply touch the probes to the test points on top of the fuse (or remove the fuse and place it in the tester).
   • Multimeter: Set your multimeter to the continuity setting (often indicated by an audible beep or an ohm symbol). With the fuse removed from its slot, touch one probe to each metal blade of the fuse. A good fuse will show very low resistance or the multimeter will beep, indicating continuity. If there's no continuity or a high resistance reading, the fuse is blown.
5. Replace (If Blown): If a fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to electrical system damage or fire.

Common Blown Fuses on this Vehicle

While fuses can blow for various reasons, some circuits are more prone to issues due to the nature of their components or common usage patterns. For the 2019 Freightliner M2 106, here are some commonly blown fuses and what to check first:

• Cigar Lighter / 12V Outlets (Interior Fuse Box, F2 or F9): These fuses often blow due to overcurrent from charging multiple devices, using high-power accessories, or a short circuit in a connected device. Check any devices plugged into these outlets first.
• Trailer Brake Control (Under-Hood Fuse Box, F10): Issues with trailer wiring, short circuits in the trailer's electrical system, or an overloaded trailer brake controller can cause this fuse to blow. Inspect trailer wiring and connections.
• Blower Motor (Interior Fuse Box, F7): A failing blower motor, a clogged cabin air filter causing the motor to work harder, or a short in the blower motor resistor can lead to this fuse blowing. Check for obstructions in the blower motor area.
• Headlights (Under-Hood Fuse Box, F5-F8): While less common, a short circuit in the headlight wiring, a faulty bulb causing a surge, or issues with aftermarket lighting can blow headlight fuses. Inspect your headlight bulbs and wiring.
• Radio / Infotainment System (Interior Fuse Box, F1): Problems with aftermarket stereo installations, a short in the radio unit itself, or issues with other connected accessories can blow this fuse. If you've recently installed new audio equipment, start troubleshooting there.

Always remember that a blown fuse is often a symptom of an underlying problem, not the problem itself. If fuses continue to blow after replacement, it's crucial to investigate the circuit for a short, an overloaded component, or another electrical fault.

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