How To: Replace the Alternator on a Chevy 5.3L Vortec V8 Engine

These step-by-step instructions and video detail an alternator replacement on a 2003 Chevy Avalanche 1500, and will be similar to replacement procedures on 2004 Chevy Avalanche models, and Chevy Avalanche 2500 from 2003, 2004, 2005, and 2006. The replacement procedures will also be similar for select Chevy Silverado 1500, 2500, and 3500 models from 2004, 2005, 2006, and 2007, as well as Cadillac Escalade models from 2003, 2004, and 2005 equipped with a 5.3L Vortec engine. Replacing a damaged or faulty alternator helps you maintain a safe, functioning electrical system, and can keep your truck’s electrical accessories running smoothly and your battery charged. If you notice your truck’s headlights or dashboard lights are dim, or if your truck’s battery is not staying fully charged, you should test and replace your alternator as soon as possible to prevent stalling and inconvenient breakdowns.

Supplies Needed for This Job:
1. Safety Glasses: https://urlzs.com/hbwc
2. Gloves: https://bit.ly/2GvfwAm
3. Alternator: http://bit.ly/2IvlBgG
4. Ratchet and Sockets: http://bit.ly/2IEAOOi
5. Breaker Bar: http://bit.ly/2UWfies

0:00 Welcome Back
0:40 Disconnect the Battery
0:51 Remove Engine Cover
1:00 Remove Air Duct
1:15 Remove the Belt
1:42 Remove the Old Alternator
2:18 Install New Alternator
2:45 Reinstall the Belt
3:06 Reinstall Removed Items

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Your Chevy Avalanche 1500’s alternator is an integral part of starting and running your vehicle. Your truck’s alternator charges the battery to help start your truck, and provides power to your truck’s electrical accessories while the engine is running, which includes power windows, radio, windshield wipers, and more. When the alternator fails, your Chevy’s electrical systems will only stay on until the battery's reserve charge is depleted. Your truck may die, but you might be able to restart it with a jump start. Replacing a worn or failing alternator on your 2003 Chevy Vortec 5.3-liter V8 engine is a straightforward repair that can help ensure your truck’s electrical system is performing properly. If you need to replace your truck’s alternator, you may notice dim headlights or that your battery is not staying fully charged. Our step-by-step instructions will help you perform an alternator replacement on your Chevy Avalanche.

Park on a level surface… open your hood… disconnect your negative battery cable and move it aside someplace safe.

Remove the accessory drive belt by using a breaker bar with a hex-head socket on the drive belt tensioner bolt.
Rotate the drive belt tensioner clockwise in order to relieve tension on the belt.
Then you can remove the belt from the pulleys and tensioner.
Slowly release the tension on the tensioner, then remove the breaker bar and socket.
Clean and inspect the belt surfaces of all the pulleys.

Take off the engine cover by loosening the intake manifold sight shield bolt.
Remove the cover from the cover retainer.
Then remove the cover retainer bolts and the retainer, if required.

Disconnect the wiring harness plug from the alternator by pushing down on the tab and pulling the connector straight out.
Slide down the protective boot to reveal the terminal stud.
Remove the battery output BAT terminal nut… and disconnect the battery output BAT cable.
Remove both mounting bolts.
You should now be able to remove the old alternator by gripping it firmly and pulling it away from the engine.

Put the new alternator in place… and secure it with the bolts you removed previously.
Torque these bolts to 37 foot pounds.
Reconnect the battery output BAT cable… and tighten the terminal nut to 13 foot pounds.
Replace the protective boot… and reconnect the wiring harness.

Reinstall the engine cover by putting it in place…
and securing it with the retainer and bolts, if required.
Tighten the bolts to 44 inch pounds.

*View full video for complete instructions*