Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Ford Explorer STFACTORY OEM SERVICE PROCEDURE
General Specifications
| Item | Specification |
|---|---|
| 2.3L EcoBoost - Base and XLT without trailer tow vehicles | |
| Rating | 150 amps |
| Generator amps at 80.6 deg. F (27 deg. C) | 94.7 amps at 750 rpm (min) to 134.7 amps at 2, 500 rpm (max) |
| Generator pulley ratio | 2.76 |
| Generator pulley replaceable | Yes |
| Generator pulley type | Overrunning Alternator Decoupler (OAD) |
| Voltage regulator type | Electronic internal with generator |
| 2.3L EcoBoost - Limited and XLT with trailer tow vehicles | |
| Rating | 220 amps |
| Generator amps at 80.6 deg. F (27 deg. C) | 112.1 amps at 750 rpm (min) to 177.3 amps at 2, 500 rpm (max) |
| Generator pulley ratio | 2.44 |
| Generator pulley replaceable | Yes |
| Generator pulley type | Overrunning Alternator Decoupler (OAD) |
| Voltage regulator type | Electronic internal with generator |
| 3.0L EcoBoost - All except police vehicles | |
| Rating | 220 amps |
| Generator amps at 80.6 deg. F (27 deg. C) | 98.1 amps at 625 rpm (min) to 180 amps at 2, 500 rpm (max) |
| Generator pulley ratio | 2.69 |
| Generator pulley replaceable | Yes |
| Generator pulley type | Overrunning Alternator Decoupler (OAD) |
| Voltage regulator type | Electronic internal with generator |
| 3.0L EcoBoost - Police vehicles | |
| Rating | 250 amps |
| Generator amps at 80.6 deg. F (27 deg. C) | 106.5 amps at 625 rpm (min) to 199 amps at 2, 500 rpm (max) |
| Generator pulley ratio | 2.69 |
| Generator pulley replaceable | Yes |
| Generator pulley type | Overrunning Alternator Decoupler (OAD) |
| Voltage regulator type | Electronic internal with generator |
| 3.3L Duratec - All except police vehicles | |
| Rating | 200 amps |
| Generator amps at 80.6 deg. F (27 deg. C) | 95.1 amps at 625 rpm (min) to 184 amps at 2, 500 rpm (max) |
| Generator pulley ratio | 2.67 |
| Generator pulley replaceable | Yes |
| Generator pulley type | Overrunning Alternator Decoupler (OAD) |
| Voltage regulator type | Electronic internal with generator |
| 3.3L Duratec - Police vehicles | |
| Rating | 250 amps |
| Generator amps at 80.6 deg. F (27 deg. C) | 106.5 amps at 625 rpm (min) to 199 amps at 2, 500 rpm (max) |
| Generator pulley ratio | 2.67 |
| Generator pulley replaceable | Yes |
| Generator pulley type | Overrunning Alternator Decoupler (OAD) |
| Voltage regulator type | Electronic internal with generator |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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