How to Pull an Alternator at a Junkyard

Alternators are a great first part: usually a few bolts, one belt, and a plug. Every car is different, so look up a quick video for your exact model before you go.

1. Match your old one first. Take a photo of your alternator's label (part number, amp rating) and the plug shape. Bring it.
2. Find the belt tensioner. Most newer cars use a spring tensioner. Put a wrench or breaker bar on it, rotate to loosen, slip the belt off. Photograph the belt routing first.
3. Disconnect the wiring. The main power cable is held by a nut under a rubber boot. Unplug the smaller connector by pressing the tab, not pulling the wires.
4. Remove the mounting bolts. Usually two or three. Some hide below. An extension helps.
5. Wiggle it out. Sometimes you have to remove an intake tube or a fan shroud first to make room.
6. Bring the main nut and bolts with you. Toss them in your parts bag.

Before you pay

• Spin the pulley by hand. It should turn smoothly and quietly, with no grinding or wobble.
• Look for signs of oil or coolant soaked into it. That usually shortens its life.
• Compare the label and plug to your photo.
• Ask the counter about warranty or exchange options. Many parts stores can bench-test an alternator for free. Check with yours.

Installing it on your car

1. Disconnect your battery's negative terminal first. The alternator's main cable is live at battery voltage.
2. Install it in the reverse order you removed the old one, and follow the belt routing photo you took.
3. Make sure the belt sits fully in every pulley groove before you release the tensioner.
4. Reconnect the battery, start the car, and make sure the battery or charging light goes off.

Torque values and exact steps vary by car. Use your car's service information or a trusted repair guide for yours. We don't publish specs we haven't verified.