How to Replace a Chevy Silverado Alternator

by Chris Moore
New car petrol engines image by Christopher Dodge from

A bad battery in your Chevy Silverado truck may not be the problem in of itself. The problem can lie in the alternator, which is responsible for recharging the battery through the engine's own mechanical motion. Replacing a bad alternator will prevent you from having to change the battery -- repeatedly. The exact process of removing and installing this component can vary, depending on the year of the Silverado and its engine type.


Step 1

Disconnect the black negative cable on the truck's battery, loosening the nut on the cable clamp to separate it from the terminal.

Step 2

Pull out the small air inlet hose on the air intake duct, then loosen the hose clamp screws at both ends of the duct, using a screwdriver, and lift the duct straight up to remove it.

Step 3

Turn the drive belt tensioner with a socket and ratchet on the bolt and slip the loosened belt from its pulleys. Slowly release the tensioner.

Step 4

Peel away the boot covering the B+ terminal, then unscrew the nut for the battery cable on the alternator using a wrench and disconnect the cable. Disconnect the alternator's main electrical connector.

Remove the alternator's mounting bolts and remove the alternator.


Step 1

Install the replacement alternator with its mounting bolts.

Step 2

Connect the electrical connector and battery cable to the alternator and cap the B+ terminal with the weather boot.

Step 3

Reinstall the drive belt using the ratchet on the tensioner. Make sure the belt follows the same path along the pulleys as before.

Step 4

Reconnect the air intake duct to the air cleaner assembly, inserting its locator pin in the insulator grommet and connecting the hose to the air flow sensor and throttle body with the hose clamps. Reconnect the air inlet hose.

Reconnect the battery cable.

Items you will need

  • Ratchet wrench
  • Screwdriver

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