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Ford Bronco/F-150 Engine Compartment Fuse & Maxi-Fuse Chart - Positions A-P

Power distribution box fuse/maxi-fuse legend listing positions A through P with amp ratings and protected circuits (headlamp flash-to-pass 20A, fuel pump relay 20A, rear window defrost 30A, etc.).

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This document is a fuse and maxi-fuse description chart, apparently for the engine compartment power distribution box of a Ford Bronco/F-Series truck. The upper table lists fuse positions A through G with amperage ratings (5 to 30/15 amps) and the circuits each protects, including headlamp flash-to-pass, daytime running lamps (Canada only), 4WABS relay #1 (Bronco only), fog lamp relay (Lightning only), horn and speed control, trailer marker and backup lamp relays, heated oxygen sensor (HO2s), backup lamps, trailer charge relay, and trailer right/left stop-turn lamps. The lower table lists maxi-fuse positions H through P (position K not used) with ratings from 20 to 50 amps, protecting circuits such as 4WABS relay #2 (Bronco only), PCM power relay and powertrain control module, fuel pump relay, starter relay, rear window defrost (Bronco only), and several positions that feed groups of interior fuse panel fuses (e.g., 'See Fuses 9 and 13'). A reader can use this chart to identify which fuse or maxi-fuse to check when troubleshooting the listed circuits and to confirm the correct amperage rating for replacement. Some entries are model-specific (Bronco Only, Lightning Only, Canada Only). The document itself does not state a model year.

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Frequently asked questions

What amperage is the fuel pump relay maxi-fuse?
Maxi-fuse position O, rated 20 amps, protects the Fuel Pump Relay. Maxi-fuse I (20 amps) also covers the PCM Power Relay, Powertrain Control Module, and Fuel Pump Relay.
Which fuse protects the horn and speed control?
Fuse position C, rated 20 amps, protects the Horn and Speed Control.
Which fuses protect the trailer stop/turn lamps?
Fuse F (5 amps) protects the Trailer Right Stop/Turn Lamps and Fuse G (5 amps) protects the Trailer Left Stop/Turn Lamps.
What does maxi-fuse M do?
Maxi-fuse M is rated 30 amps and protects the Rear Window Defrost circuit (Bronco Only).
Which fuses relate to the 4WABS system?
Fuse B (30/15 amps) protects 4WABS Relay #1 (Bronco Only), fuse E (15 amps) includes 4WABS (Bronco Only), and maxi-fuse H (30 amps) protects 4WABS Relay #2 (Bronco Only).

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