2023 Kenworth T680 Fuse Box Diagram & Amperage

Quick Answer

Your 2023 Kenworth T680 is equipped with multiple fuse box locations to protect its extensive electrical systems. You'll find fuse boxes primarily under the hood, behind the passenger side kick panel (or accessible from the glovebox area), and sometimes in the sleeper compartment depending on the trim and options.

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Under-Hood Fuse Box

This fuse box, typically located on the driver's side near the firewall, houses fuses and relays for critical engine functions, lighting, and major accessories. Always consult the diagram on the inside of the fuse box cover for the most accurate information for your specific T680 configuration, as variations can occur.

Fuse #	Amp	Color	Circuit / Component Protected
F1	15A	Blue	ECM (Engine Control Module) Power
F2	10A	Red	PCM (Powertrain Control Module) Power
F3	20A	Yellow	Fuel Pump
F4	20A	Yellow	Ignition Switch
F5	30A	Green	Starter Relay
F6	15A	Blue	Headlights (Low Beam - Left)
F7	15A	Blue	Headlights (Low Beam - Right)
F8	15A	Blue	Headlights (High Beam - Left)
F9	15A	Blue	Headlights (High Beam - Right)
F10	10A	Red	Tail Lights / Marker Lights
F11	20A	Yellow	ABS (Anti-lock Braking System) Controller
F12	10A	Red	Trailer Marker Lights
F13	20A	Yellow	Trailer Brake Controller Power
F14	20A	Yellow	A/C Clutch
F15	30A	Green	Blower Motor

Relay Locations (Under-Hood):

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: Headlight Relay (Low Beam)
• R4: Headlight Relay (High Beam)
• R5: Ignition Relay
• R6: ABS System Relay

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Dash / Cabin Fuse Box

Typically located on the passenger side kick panel or accessible by removing the glovebox liner, this fuse box handles interior accessories, instrumentation, and various cabin systems. Again, verify with your vehicle's specific fuse legend.

Fuse #	Amp	Color	Circuit / Component Protected
F1	10A	Red	Radio / Infotainment System
F2	15A	Blue	HVAC Control Module
F3	20A	Yellow	Blower Motor (Cabin)
F4	15A	Blue	Wiper Motor
F5	10A	Red	Instrument Cluster
F6	20A	Yellow	Power Outlet / Cigar Lighter (Dash)
F7	10A	Red	Dome Lights / Interior Lighting
F8	15A	Blue	Power Windows (Driver)
F9	15A	Blue	Power Windows (Passenger)
F10	10A	Red	Turn Signals / Hazard Lights
F11	5A	Tan	Airbag System (SRS)
F12	10A	Red	Brake Lights
F13	10A	Red	Diagnostic Port (OBD-II/J1939)
F14	15A	Blue	Trailer ABS Power
F15	20A	Yellow	Auxiliary Power Outlet (Sleeper - if equipped)

Relay Locations (Dash / Cabin):

• R1: Accessory Relay
• R2: HVAC Blower Relay
• R3: Wiper Relay

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Sleeper / Rear Cargo Fuse Box (If Equipped)

Some T680 models with extensive sleeper amenities or specific configurations may have an additional fuse box located in the sleeper area, often near the bunk or in a side compartment. This box usually protects components specific to the sleeper, such as power inverters, refrigerators, auxiliary lighting, and entertainment systems.

Fuse #	Amp	Color	Circuit / Component Protected
F1	20A	Yellow	Sleeper Power Outlet / 12V
F2	15A	Blue	Sleeper HVAC (Auxiliary)
F3	10A	Red	Sleeper Interior Lights
F4	20A	Yellow	Refrigerator Power
F5	15A	Blue	Auxiliary Inverter (Low Power)
F6	30A	Green	Auxiliary Inverter (Main Power - if installed)
F7	10A	Red	Entertainment System (Sleeper)
F8	15A	Blue	TV Power (Sleeper)
F9	15A	Blue	Bunk Heater (Auxiliary)

Relay Locations (Sleeper / Rear Cargo):

• R1: Sleeper Accessory Relay
• R2: Inverter Control Relay

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How to Test a Fuse

Testing a fuse is a straightforward process to determine if it's blown. You'll need a fuse puller (often located in the fuse box lid) and a multimeter or a fuse tester.

1. Locate the Fuse: Identify the suspect fuse using the diagrams above and your vehicle's fuse box legend.
2. Remove the Fuse: Carefully pull the fuse straight out of its slot using the fuse puller.
3. Visual Inspection: Many fuses have a visible wire inside. If this wire is broken or melted, the fuse is blown. Transparent fuses are easy to check this way.
4. Test with a Multimeter: Set your multimeter to the ohm (continuity) setting. Touch one probe to each metal terminal on the fuse. A good fuse will show a reading close to zero ohms (indicating continuity) or beep on the continuity setting. A blown fuse will show an "OL" (open loop) or no reading, indicating no continuity.
5. Test with a Fuse Tester: Insert the fuse into the tester. Most testers will light up if the fuse is good.
6. Replace if Blown: If the fuse is blown, replace it with a new fuse of the exact same amperage and type. Never use a fuse with a higher amperage rating, as this can lead to serious electrical damage or fire.

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Common Blown Fuses on This Vehicle

While any fuse can blow, some are more common than others due to the nature and load of their circuits.

• Cigar Lighter / 12V Power Outlets (Dash & Sleeper): These are frequently blown by overloads from charging devices, air compressors, or other accessories. If your power outlets aren't working, check these fuses first.
• Trailer Brake / Trailer Marker Lights: Issues with trailer wiring or a short in the trailer itself can often blow these fuses, especially after connecting a new or faulty trailer.
• Blower Motor (Cabin): A failing blower motor or obstructions in the HVAC system can cause the blower motor fuse to blow due to excessive current draw. If your cabin fan stops working, check this fuse.
• Headlights / Tail Lights: While less common on modern trucks, a short in a bulb or wiring can still occasionally cause a lighting fuse to blow. If an entire side of lights or all of a certain type of light (e.g., tail lights) stop working, check the corresponding fuse.

Always remember to check what you were doing or what accessories you were using right before the electrical component stopped working. This often gives a strong clue as to which circuit experienced the overload.

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