* Your vehicle's sticker: Look for a sticker under the hood or in the glove compartment that lists specifications. This is the most reliable source.
* The alternator itself: The amperage rating is usually stamped directly on the alternator. You'll need to locate the alternator (usually near the engine's front) to check this.
* A parts catalog: Use the vehicle's VIN number with a parts catalog (like a Ford dealer parts website or online parts store) to look up the correct alternator for your specific vehicle.
Without knowing your specific engine (4.0L, 5.0L, etc.) and options, it's impossible to give you a precise amperage.
