How do you Change, Replace, or Install 2000-2005 Chevrolet Impala 3800 Alternator Replacement
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10mm socket/ratchet with extension
13mm socket/ratchet with extension
15mm socket/ratchet with extension
Step 1: Open the vehicle's hood.
Step 2: Using the 8mm wrench, disconnect the vehicle's negative battery cable.
Step 3: Loosen and remove the 13mm bolts (2) that secure the brace across the engine compartment. Remove this brace.
Step 4: Loosen and remove the 10mm bolts (2) that secure the coolant tank to the vehicle. You can now lift the coolant tank out of your way.
You don't have to disconnect the hose, as we only needed to move it out of our way!
Step 5: Remove the oil cap, and pull the engine cover off of the engine.
Step 6: Loosen the 15mm belt tensioner bolt (1) to release tension on the belt. You can now remove the belt from the vehicle.
If your belt looks worn or frayed, it's a great time to replace it. After all, we already have it out of the vehicle, so it'll never be easier than it is right now!
Step 7: Disconnect the wiring harness (1) from the BACK of the alternator. Pull back the rubber boot to expose the battery connection. Loosen and remove the 13mm connection bolt (1).
Step 8: Loosen and remove the 10mm bolt (1) that secures the brace to the back of the engine mount.
Step 9: Loosen and remove the 15mm bolt (1) located on TOP of the alternator.
Step 10: Loosen and remove the 15mm mounting bolts (2) that secure the alternator to the engine.
Step 11: Using the flathead screwdriver as a lever, pry and remove the alternator from the vehicle.
Step 12: Mount the new alternator by tightening the 15mm mounting bolts (2).
Step 13: Tighten the 15mm mounting bolt (1) on TOP of the alternator to secure the brace. Secure the other end of the brace by tightening 10mm bolt (1).
Step 14: Tighten the 13mm battery connection bolt (1), and cover it with the rubber boot. Reconnect the wiring harness (1).
Step 15: Route the belt, per the diagram provided near the radiator, and tighten the 15mm tensioner bolt.
The belt should be taut, but not overly tight!
Step 16: Attach the engine cover and screw the oil cap back into place.
Step 17: Reattach the engine compartment brace by tightening the 13mm mounting bolts (2).
Step 18: Reattach the coolant reservoir by tightening the 10mm mounting bolts (2).
Step 19: Reconnect the negative battery cable using the 8mm socket/ratchet.
These Part Change / Installation Instructions Apply to
05 2005, 04 2004, 03 2003, 02 2002, 01 2001, 00 2000 Chevrolet Impala 3800 Alternator Replacement Instructions
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