The 2008 Ford F150 has three fuse boxes: one in the passenger compartment, and two auxiliary relay boxes (one with Daytime Running Lamps (DRL) and one without). Locating the right fuse for your specific need can be tricky. This guide will help you find the 2008 Ford F150 Obd2 Fuse Location and understand the layout of each fuse box.
Passenger Compartment Fuse Panel
The passenger compartment fuse panel is located under the dashboard, on the driver’s side, to the left of the steering column. It’s accessible after opening a small access door. This panel houses the majority of the fuses related to interior functions and some core electrical systems.
This panel contains fuses for various components, including:
- Wipers: Fuse #1 (10A Mini)
- Instrument Cluster: Fuse #1 (10A Mini), Fuse #15 (5A Mini), Fuse #21 (15A Mini)
- Audio System: Fuse #1 (10A Mini), Fuse #31 (20A Mini)
- Stop/Turn Lamps: Fuse #2 (20A Mini)
- ABS: Fuse #2 (20A Mini), Fuse #14 (10A Mini)
- Power Mirrors: Fuse #3 (5A Mini)
- Fuel Pump: Fuse #9 (20A Mini)
- A/C Clutch: Fuse #11 (10A Mini), Fuse #32 (15A Mini)
- Headlamps (Low Beam): Fuse #23 (10A Mini), Fuse #25 (10A Mini), Fuse #40 (20A Mini)
- Headlamps (High Beam): Fuse #35 (20A Mini)
- Horn: Fuse #26 (20A Mini)
- Radio: Fuse #7 (5A Mini), Fuse #31 (20A Mini)
Auxiliary Relay Boxes
The auxiliary relay boxes are located under the hood. The location can vary slightly depending on engine type and options. Consult your owner’s manual for the precise location on your specific truck.
Auxiliary Relay Box (with DRL)
This box primarily houses relays, including those for the 4×4 system and Daytime Running Lamps (DRL). It also includes a fuse for clockspring illumination (Fuse F03, 5A ATO).
Auxiliary Relay Box (without DRL)
Similar to the box with DRL, this version also manages relays and diodes. It includes the A/C clutch relay and a fuse for clockspring illumination (Fuse F03, 5A ATO).
Locating the OBD2 Fuse
The OBD2 port itself doesn’t have a dedicated fuse. However, its power is often tied to other circuits within the vehicle. On the 2008 Ford F150, the OBD2 port’s power is typically related to the Cigar Lighter/Diagnostic Connector Power circuit. This circuit is protected by Fuse #110 (20A FMX/JCase) in the passenger compartment fuse panel under the hood.
If your OBD2 port isn’t working, check Fuse #110 first. If this fuse is blown, replacing it might solve the issue. Always replace a blown fuse with one of the same amperage. If the new fuse also blows, you likely have a short circuit that needs professional diagnosis.
Conclusion
Understanding your 2008 Ford F150’s fuse box locations and layout is crucial for troubleshooting electrical issues. While the OBD2 port doesn’t have its own fuse, its functionality relies on other circuits, primarily the one protected by Fuse #110. Always consult your owner’s manual for the most accurate information specific to your vehicle. If you encounter persistent electrical problems, seek assistance from a qualified automotive technician.
