Where is the starter relay on a 2010 Ford Fiesta?
The starter relay is typically located in the engine bay in the large under-hood fuse/relay box on the driver's side, usually labeled ST or START. In some markets, Ford uses the ignition switch to feed the starter directly, so there may be no separate starter relay in that box.
Location and identification
Understanding the Fiesta’s starting circuit helps you find the exact relay. While most 2010 Fiestas place a dedicated starter relay in the engine bay fuse box, regional variations can mean no separate relay at all—the starter may be controlled directly by the ignition switch or a powertrain control module (PCM) signal.
To locate the precise relay in your car, use these steps:
- Open the hood and locate the large black plastic fuse/relay box in the engine bay, typically on the driver's side near the strut tower and battery.
- Lift the lid and check the diagram printed on the inside of the box cover for relay labeling.
- Look for a relay labeled "ST", "START", or "S" among the rows of relays.
- If you find a starter relay, note its position for testing or replacement. If you don’t see a labeled starter relay, your Fiesta may energize the starter directly from the ignition switch or PCM, and there may be no separate relay in that box.
- If you need to test or swap, you can temporarily swap the starter relay with another similar Ford relay (same pin count and amperage) to see if the starting behavior changes, or use a multimeter to verify voltage on the appropriate terminal when the key is in START.
Bottom line: Follow the diagram in the under-hood fuse box to identify the starter relay. If no dedicated relay exists in your configuration, expect the ignition switch or PCM to control the starter directly.
What to do if you can't locate a starter relay
In some 2010 Fiesta configurations, there is no separate starter relay and the starting signal is supplied through the ignition switch directly to the starter solenoid. If you can't find a labeled "Starter Relay" in the engine bay, focus the diagnostic on the ignition switch, wiring, and the starter motor itself. Checking battery voltage, ignition feed, and the wiring to the starter can help diagnose starting problems.
Testing tips
When testing, ensure the vehicle is safely immobilized and the battery is disconnected before removing or swapping relays. If you’re not comfortable performing electrical tests, have a qualified technician verify the circuit diagram for your exact VIN and regional model.
Summary: On a 2010 Ford Fiesta, the starter relay is usually in the engine bay’s under-hood fuse/relay box on the driver’s side and is often labeled ST or START. Some regional configurations do not use a separate starter relay, in which case the ignition switch energizes the starter directly. Always consult the box diagram for your specific vehicle to confirm the exact layout.
