Where is the starter relay located on a Ford F-150?

The starter relay on most Ford F-150s is located in the engine bay, inside the under-hood power distribution box (the big fuse/relay panel). Look for a relay labeled STARTER or ST on the lid’s diagram.

Exact placement can vary by model year and engine. If you don’t find a STARTER relay in the primary under-hood box, it may be in a separate Battery Junction Box near the battery, or the system may control the starter directly through the engine computer. Always check the fuse/relay diagram on the inside of the box cover or consult the owner's manual for your specific year and engine.

Common starter relay locations in the Ford F-150

Use the list below to identify where to look for the starter relay on your truck. Each item describes typical locations and how to access them safely.

• Under-hood Power Distribution Box: The large fuse/relay box in the engine bay, usually on the driver's side or near the center. Open the box and locate the relay labeled STARTER, ST, or something similar; the cover diagram identifies the exact position.


• Battery Junction Box (BJB): Some F-150s place the starter relay inside a separate box near the positive battery terminal. Remove the cover or panel as needed and look for a STARTER relay inside this box.


• Secondary fuse panels: In a few configurations, a starter-related relay could be in another fuse panel (cab area or near the glove box), though this is less common on recent models. Always verify with the diagram on the cover.

These are the most common spots to locate the starter relay. If you’re unsure, consult the diagram on the fuse box cover or the official documentation for your exact year and engine.

How to identify and test the starter relay safely

Once you locate the relay, confirm you’ve found the starter control by examining the wiring: a hot feed from the battery or fuse box connected to the relay input, and a control signal from the ignition switch or engine computer on the output terminal. If the starter doesn’t engage, you can test with a multimeter or swap in a known-good relay of the same amperage rating, with proper safety precautions.

Always disconnect the negative battery cable before removing or replacing relays, and use insulated tools to avoid shorts. If you’re not confident performing electrical diagnostics, seek a professional mechanic.

Notes for specific model years

Ford F-150s from different generations may reorganize electrical routing. For example, 11th generation (2021–present) models rely more on electronic controls for the starter, while earlier generations may place the starter relay in the power distribution box or battery area. Verify with the diagram inside the fuse box cover or the official manual for your year and engine.

Summary

The starter relay on a Ford F-150 is most often found in the engine bay’s under-hood power distribution box, with the exact position labeled on the lid’s diagram. If it isn’t there, check the Battery Junction Box near the battery. Always refer to the fuse box diagram or your owner’s manual for your truck’s exact year and engine to confirm the precise location.

Bottom line: start with the under-hood power distribution box and use the diagram to confirm the exact STARTER relay position, then move to the battery junction area if needed.

How do I reset my Ford F-150 after replacing the battery?

You can see one two three so now that that has blinked three times it tells you that it's reset. So that's as easy as it is to replace the battery on an F-150.

How to tell if a starter or starter relay is bad?

1. Engine Fails to Crank. One of the most obvious signs of a faulty starter relay is the engine failing to crank when the ignition key is turned.
2. Intermittent Starting Issues. A failing starter relay may cause inconsistent starting behavior.
3. Clicking Noise When Starting.
4. Starter Motor Stays on after Engine Starts.

Where is the starter relay located on a Ford F150?

Up. On the back side of the cover you have a small fuse diagram. Okay so the starter fuse it's fuse number 13 which is a 30 amp fuse located right here responsible for power to the starter relay.

What's the best oil for an F-150 engine?

2025 and Beyond