Check the owner manual panel chart first, then match each circuit slot by amperage rating and position to avoid installing the wrong protective link and damaging wiring components.
The power distribution center under the hood contains high-current links rated from 20A to 60A, typically assigned to systems like cooling fans, ABS module, and starter relay, while the cabin panel uses 5A to 30A elements for lighting, radio, and accessory outlets.
Each slot is labeled with abbreviations such as PCM, IGN, ACC, and HVAC, which correspond to control modules and subsystems; incorrect replacement can lead to partial system failure or intermittent faults rather than a complete shutdown.
Use a test light or multimeter to verify continuity across the metal strip inside each link instead of relying on visual inspection, since micro-cracks are not always visible but still interrupt current flow.
06 Ford F150 Fuse Box Diagram With Relay Locations and Circuit Details
Match each slot to its labeled circuit before replacing any component; under-hood power distribution contains high-load links for starter, cooling fan, and ABS pump, while cabin-mounted panel handles lower current systems such as interior lighting, radio memory, and power windows, with ratings clearly marked from 5A up to 60A.
Relays are positioned alongside these slots and control switching for systems like fuel pump, horn, and air conditioning clutch; identify them by rectangular housings labeled with codes such as R01, R02, and match to the printed legend inside the cover, ensuring correct orientation when reinstalling since reversed placement can interrupt signal flow or prevent activation of key vehicle functions.
How to identify each fuse and relay in 06 Ford F150 panel layout
Read the legend printed on the cover first, then align each numbered slot with its corresponding circuit name and amperage rating to prevent mismatched replacements.
Each protective element uses a color-coded plastic body that indicates its rating, where tan = 5A, red = 10A, blue = 15A, yellow = 20A, and green = 30A; higher current units in the engine compartment may use larger cartridge-style components rated above 40A.
Slot numbering typically follows a grid pattern starting from the top left corner, moving horizontally; check for small embossed numbers near each position since printed labels can fade over time due to heat exposure.
Relays are distinguishable by their rectangular shape and larger size compared to blade-style elements, often grouped together near the edge of the panel for easier access and heat dissipation.
Use the underside cover map to match relay codes such as R201 or R302 with systems like fuel delivery, cooling fan activation, or ignition switching; incorrect placement can result in non-responsive components.
In the engine compartment, high-current distribution is separated into dedicated sections, with battery feed lines routed directly into heavy-duty slots that supply power to starter motor and charging system.
Check for shared circuits where multiple systems rely on a single protective element, such as accessory power outlets and interior lighting; identifying these links helps trace faults affecting more than one function at once.