2016 Ford F-350 Super Duty — Fuse Box Diagram & Amperage

Quick answer

• Under-hood: Power Distribution Box (driver-side engine bay). Contains high‑amperage fuses and most relays (PCM/ECM, fuel pump on gas models, ABS, A/C clutch, blower motor, headlights, trailer tow power/charge, starter relay, etc.).
• In-cab: Passenger Compartment Fuse Panel (left end of the dash, behind side cover; open driver door to access). Protects body electronics (radio/infotainment, airbag SRS, brake light switch, ignition/run feeds, power points/cigar lighter, HVAC controls, windows/locks, trailer brake controller logic, etc.).
• Trunk/cargo: Not applicable on pickup models (no rear cargo fuse panel from the factory).

Note: Ford used more than one fuse/relay layout in the 2016 Super Duty depending on engine (6.2L gas vs. 6.7L diesel), trim, and trailer/upfitter equipment. The charts below show the most common 2016 F‑350 Super Duty configuration. Always verify against the printed legend inside the fuse/relay box lid for your exact vehicle.

Under-hood Power Distribution Box (PDB) — common 2016 F‑350 layout

Location: Driver-side engine bay, near the battery. Lift the cover to see the diagram on the underside.

Relays in the under-hood PDB (verify locations/labels on lid):

• Starter relay — engages starter solenoid during crank
• PCM/ECM power relay — powers engine controls
• Fuel pump relay (gas engines) — powers in-tank pump
• Blower motor relay — HVAC high‑current feed
• A/C clutch relay — engages compressor clutch
• Trailer tow battery charge relay — charges trailer battery with engine running
• Trailer park/backup lamp relays — trailer lighting feeds

Notes:

• Diesel 6.7L uses a low‑pressure lift pump and high‑pressure pump commanded by the PCM; fuse/relay labeling differs and there is no conventional “fuel pump” fuse in some builds. Confirm on the lid diagram.
• Headlamp fusing may be split left/right. If one side is out, check both headlamp fuses.

Passenger Compartment Fuse Panel (left dash end cap) — common 2016 F‑350 layout

Location: Left side of the instrument panel, behind the small side cover accessible with the driver door open.

Notes:

• Power point/cigar lighter outlets are individually fused; if one 12V socket works and another doesn’t, check each outlet’s dedicated fuse above.
• Some SRS/airbag fusing may be located in the PDB depending on build; always confirm on the lid.

Relays near/in passenger compartment:

• Most body relays are integrated in the under‑hood PDB on this platform; the in‑cab panel is primarily fuses.

How to test a fuse

• Visual check: Remove the suspect fuse with a puller and look through the transparent body. If the metal link is melted/broken, the fuse is blown. This can miss hairline breaks, so confirm electrically.
• Test light method: With the circuit powered, probe both test tabs on top of the fuse. Good fuse = power on both tabs. Power on one side only = blown fuse. No power on either = upstream issue (feed/relay/ignition off).
• Multimeter method: With power off, check continuity across the fuse. 0–1 ohm = good; OL/open = blown. Or, with key on, check for battery voltage on both test tabs.
• Replace only with the same amperage and mini‑fuse type. If a new fuse blows immediately, stop and diagnose the shorted circuit/component before replacing again.

Common blown fuses on this vehicle (what to check first)

• 12V power points/cigar lighter inoperative: One or more 20A yellow fuses in the in‑cab panel (often F10–F12). Check for coins/debris in the socket causing a direct short, especially in the console and dash outlets.
• Radio/infotainment dead: 15A blue fuse for radio (often F14) in the in‑cab panel. Also verify the retained accessory power (RAP) feed and ground at the radio.
• Headlight out on one side: Under‑hood PDB 25A clear fuses for left/right low or high beams. Swap/check bulbs and headlamp connector for heat damage.
• Blower motor inoperative: 40A orange fuse and blower relay in the under‑hood PDB. If the fuse is good but only high speed works, suspect the blower resistor/module. If nothing works, check for power at the blower connector and the HVAC control fuse in‑cab.
• A/C not engaging: 15A blue A/C clutch fuse and A/C clutch relay in the PDB. Also confirm adequate refrigerant charge and that the pressure sensor circuit is intact.
• No crank: Starter relay in the PDB and related ignition/PCM fuses. Verify battery condition, terminals, and that the transmission is in Park/Neutral. Check for security (PATS) issues.
• ABS light on, no communication: 30A–40A ABS feed fuses in the PDB and 15A valves/module fuse. Inspect the main ABS pump connector and grounds near the left frame rail.
• Trailer brakes/lights inoperative: Under‑hood PDB 30A green feed to the trailer brake controller and 20A yellow/25A clear trailer lighting fuses/relays. Corrosion in the 7‑way socket and chafed wiring at the hitch are common.

Reminder: Ford used multiple fuse box layouts in 2016 Super Duty. Use the diagram on your specific fuse box lid as the final authority for cavity numbers.

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