Difficulty
Moderate
Steps
5
Time Required
30 minutes - 1 hour
Sections
1
- Alternator
- 5 steps
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Back1999-2007 GMC Sierra
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Introduction
What you need
Step 1
Alternator
- Using an 8mm wrench, disconnect the negative battery terminal. This is the one on the right (closest to the engine).
- Caution: Hazardous situation which, if not avoided, could result in minor or moderate injury.
Using an 8mm wrench, disconnect the negative battery terminal. This is the one on the right (closest to the engine).
Caution: Hazardous situation which, if not avoided, could result in minor or moderate injury.
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Step 2
- Loosen the hose clamps on the factory intake tube with an 8mm socket and remove the intake tube. One hose clamp will be located at the port of the intake manifold and one will be near the factory air box.
Loosen the hose clamps on the factory intake tube with an 8mm socket and remove the intake tube. One hose clamp will be located at the port of the intake manifold and one will be near the factory air box.
Step 3
- Remove the black wire from the back of the alternator using a 10mm socket and disconnect the voltage sensor. For the Voltage sensor, depress the tab towards the base of the sensor and pull outwards.
Remove the black wire from the back of the alternator using a 10mm socket and disconnect the voltage sensor. For the Voltage sensor, depress the tab towards the base of the sensor and pull outwards.
Step 4
- Using a 15mm socket on a half inch socket wrench, loosen the belt tensioner by pushing downwards. The tensioner is spring loaded so you will need to use your free hand to remove the serpentine belt.
Using a 15mm socket on a half inch socket wrench, loosen the belt tensioner by pushing downwards. The tensioner is spring loaded so you will need to use your free hand to remove the serpentine belt.
Step 5
- Using a 16mm socket, remove both alternator mounting bolts and remove the alternator. These will be located at the base of the alternator. You may need a crowbar to remove the alternator from the mounting bracket because the mounting points often rust.
- After replacing the alternator, make sure the battery is fully charged before starting the vehicle. You can do this by using a battery charger. Connect the red (positive) lead to the red (positive) battery terminal. Then do the same for the negative lead and terminal (black).
- Set the charger to 12V and TRICKLE CHARGE, then wait until the indicator reads FULL CHARGE.
Using a 16mm socket, remove both alternator mounting bolts and remove the alternator. These will be located at the base of the alternator. You may need a crowbar to remove the alternator from the mounting bracket because the mounting points often rust.
After replacing the alternator, make sure the battery is fully charged before starting the vehicle. You can do this by using a battery charger. Connect the red (positive) lead to the red (positive) battery terminal. Then do the same for the negative lead and terminal (black).
Set the charger to 12V and TRICKLE CHARGE, then wait until the indicator reads FULL CHARGE.
To reassemble your device, follow these instructions in reverse order.
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Nolan Cychowski
Member since: 09/29/2020
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Team
University of Memphis, Team S3-G5, Willis Fall 2020
Member of University of Memphis, Team S3-G5, Willis Fall 2020
UM-WILLIS-F20S3G5
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1 Guide authored
C S F - 21 hours agoJan 23, 2023
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Good overview
