# Circuit Protection

## Fuses

### REPLACEMENT

On some models, it is necessary to remove this door to access the interior fuse box

Remove the fuse panel cover

To remove a fuse, grasp the fuse and pull it straight out carefully

Fuses are located either in the engine compartment or passenger compartment fuse and relay panels. If a fuse blows, a single component or single circuit will not function properly.

1. Remove the fuse or relay box cover.
2. Inspect the fuses to determine which is faulty.
3. Unplug and discard the fuse.
4. Inspect the box terminals and clean if corroded. If any terminals are damaged, replace the terminals.
5. Plug in a new fuse of the same amperage rating.

   WARNING
   Never exceed the amperage rating of a blown fuse. If the replacement fuse also blows, check for a problem in the circuit.

6. Check for proper operation of the affected component or circuit.

## Maxi-Fuses (Fusible Links)

Maxi-fuses are located in the engine compartment relay box. If a maxi-fuse blows, an entire circuit or several circuits will not function properly.

### REPLACEMENT

1. Remove the fuse and relay box cover.
2. Inspect the fusible links to determine which is faulty.
3. Unplug and discard the fusible link.
4. Inspect the box terminals and clean if corroded. If any terminals are damaged, replace the terminals.
5. Plug in a new fusible link of the same amperage rating.

WARNING
Never exceed the amperage rating of a blown maxi-fuse. If the replacement fuse also blows, check for a problem in the circuit(s).

- Check for proper operation of the affected circuit(s).

## Circuit Breakers

### RESETTING AND/OR REPLACEMENT

Circuit breakers are located inside the fuse panel. They are automatically reset when the problem corrects itself, is repaired, or the circuit cools down to allow operation again.

## Flashers

### REPLACEMENT

Location of the flasher assembly—F-150 models

The turn signal flasher assembly is located under the driver's side of the instrument panel, on the front of the fuse panel for the 1997-98 F-250HD, F-350 and F-Super Duty models and under the center section of the instrument panel in the relay/flasher block on all other models.

1997-00 F-150/F-250 engine compartment fuse box locations

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1997-00 F-150/F-250 interior fuse box locations

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1997-98 F-250HD, F-350 and F-Super Duty models interior fuse box locations

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1997-98 F-250HD, F-350 and F-Super Duty models engine compartment fuse box locations—gasoline engines

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1997-98 F-250HD, F-350 and F-Super Duty models engine compartment fuse box locations—diesel engines

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1997-00 Expedition and Navigator engine compartment fuse box locations

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1997-00 Expedition and Navigator interior fuse box locations

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1999-00 F-250SD, F-350 and F-Super Duty models interior fuse box locations

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1999-00 F-250SD, F-350 and F-Super Duty models engine compartment fuse box locations—gasoline engines

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1999-00 F-250SD, F-350 and F-Super Duty models engine compartment fuse box locations—diesel engines

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