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30% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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Receive Up To 30% Off Your Online Purchase Of Select Parts And Accessories
Use promotional code MMJ30 at checkout to receive 30% off the following categories: Select Brake Parts, Select Hi-Performance and Truck Accessories, Batteries, Paint, Splash Guards, Select Ventvisors & Bug Shields, Springs & Spacers, Water Pumps, Belts, A/C Parts, Starters, Alternators, Fuel Pumps, Radiators, Radiator Fans, Thermostats, Caps & Clamps, Clutches, Spark Plugs, Plug Wires, CV Axles, Battery Chargers & Booster Cables, OE Locks, Rack & Pinons, Window Motors, RainX Wipers, Appearance Chemicals, Floor Mats, Lift Equipment, Hand Tools, Travel Accessories, Car Covers, Seat Covers, Wheel Covers, Body Repair, Collectibles and Apparel.

Use promotional code MMJ20 at checkout to receive 20% off the following categories: Ignition, Shocks & Struts, Chassis, Jumpstarts, Air Filters, Oil Filters, Bearings & Seals, Engine Parts, Wash Accessories, Outdoor Lifestyle, Towing, Mini Air Compressors, Tire Repair Accessories, Mufflers, Grease/Oil, Additive Chemicals, P/S Pumps, Cooling Product, Timing Belts, Specialty Tools, Radiator Hose, Motor Mounts, Mirrors, Lug Nuts, Sealants/Adhesives, Fuel Filters, P/S Hoses, Gas Cans, Oil Change Accessories, Help, Wiper Motors, Loaner Tools, Air Compressors, Horns, Books, Distributors, Sun Control and Exhaust Adapters.

Use promotional code MMJ15 at checkout to receive 15% off the following categories: Test Equipment, Power Tools, Emergency Supplies, Electronics and Stereo & Accessories (MAP pricing Exclusions).

Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes the following brands: WeatherTech, Champion, Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner, Philips and BBK Performance. Valid online until 11:59 PM EST on 11/22/17.

Receive 10% Off Wagner branded brake parts with your online purchase. Use promotional code: WAGNER10.

Receive 20% Off Select Champion branded products with your online purchase. Use promotional code: CHAMP20.

Receive 10% Off Select FelPro branded products with your online purchase. Use promotional code: FELPRO10.

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Haynes Tech Tips - Alternator Replacement


Your alternator provides the electrical current necessary to keep your battery charged. When your alternator malfunctions, the charging light on your dash will usually be on or the gauge will indicate a discharge. Also, you will likely have starting problems (the engine cranks slowly or will not crank at all). Keep in mind that other problems, such as a bad battery or starter, may produce some similar symptoms. It’s best to have your charging and starting systems checked before assuming the alternator is at fault.


Disconnecting the battery is a necessary part of this procedure. Computers in some vehicles must “re-learn” certain operating data after the battery has been disconnected. On these vehicles, specific procedures must be followed to ensure normal operation after the battery is re-connected. See your service manual for details on your particular vehicle.

  1. Purchase a service manual for your vehicle. It contains essential information for getting the job done safely and correctly the first time.
  2. Open the hood. The alternator is located at the drivebelt end of the engine (it is driven by the belt). Most often the alternator is high on the engine and accessible from under the hood. Sometimes, however, access is easier from underneath the engine compartment, requiring the vehicle to be raised and supported securely on jackstands.
  3. Check the belt to be sure it is tight and in good condition. A damaged or slipping belt will cause the alternator to malfunction.
  4. Disconnect the cable from the negative terminal of the battery (see Caution above).
  5. Note how the drivebelt is routed, then remove it. On most modern vehicles, you’ll need to rotate a spring-loaded tensioner away from the belt, relieving the tension so the belt can be slipped off the pulleys (see illustration). On some models, you may need to loosen the alternator mounting bolts to relieve the belt tension.

  6. Most vehicles have spring-loaded tensioners that must be rotated away from the belt. Here, a ratchet is being used (a ½-inch square hole is in the tensioner). On some vehicles, you’ll need to use a wrench or socket

  7. Disconnect the electrical connectors from the alternator (see illustration).

  8. Remove the electrical connectors from the alternator (right arrows), then remove the mounting bolts (left arrows) (typical)

  9. Unscrew the alternator mounting bolts and remove the alternator from the engine compartment.
  10. Installation is the reverse of removal. Be sure to follow all procedures in your service manual regarding battery re-connection.