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The voltage regulator in most newer GM cars is in the alternator. The simplest way to replace the voltage regulator is to install a rebuilt alternator, it is also the most expensive.
To replace the voltage regulator in your alternator:
1. Remove the ground cable from the battery.
2. Unplug the wires to the alternator.
3. Remove the alternator.
5. This is a good time to check the alternator bearings. Spin the pulley and if the alternator is noisy or stops almost immediately you probably need new bearings.
6. Take out the bolts that hold the alternator halves together and take the halves apart. Mark the halves so you know where to put them back.
7. This is a good time to check the brushes. If they are excessively worn it is a convenient time to replace them. Look at the commutator, it should be smooth.
Take a look at the field coils to see if they are burned. or have any broken wires.
7. Take out the old voltage regulator and install the new one.
8. There are two tiny holes in the brush holder. Insert a wire in the holes to hold the brushes back so that you can get them over the commutator. The wires should extend to the outside of the housing so that you can pull them out when the alternator is put back together.
9. Put the two halves back together aligning the marks so you have it in the right orientation. Put the bolts back in and tighten them.
10. Pull out the wires that held the brushes away from the commutator.
11. Put the alternator back in place, install the wires and the belt. Tighten the drive belt..
12. Put the ground back on the battery.
13. Start the engine and check to see if the alternator is now charging the battery.
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