Inside the alternator
The voltage regulator is located within the alternator. 1973 and up GM used the integral design, 1972 and down GM used a voltage regulator mounted externally.
On GM vehicles it is inside the alternator and is not serviceable.
Original equipment would have had an external voltage regulator. Internal regulators came out in the 1973 model year for GM.
To change the voltage regulator on almost all modern GM cars, replace the alternator. The regulator is inside the alternator, and is not considered a field servicable part.
Most GM alternators are internally regulated. Yes, it is built into the alternator.
Almost all GM vehicles come with an altinator that has a "built in" voltage regulator. Unless you are familiar with rebuilding GM type altinators(sp) I would just consider having it tested to determine if it's truly bad or possibly another issue.
The voltage regulator is mounted on the back of the alternator. Go to autozone.com and look up the regulator you will see a picture of it. Sign in for free and you can use there do it yourself section. This will give you a step by step on how to change it. Good luck. GM
Almost all GM alternators (circa 1970 and newer) have a fully integrated Delcotron alternator. The regulator is inside the alternator.
The regulator won't be shown separately on your Pontiac. Most GM vehicles of that vintage had Alternators with built in regulators.
Inside the alternator. All GM products have been internally regulated since about 1972.
I believe the voltage regulator is built into the alternator of GM vehicles and most American made automobiles, for that matter. I have found those components at auto parts stores and have changed them out myself, in the past.
Sounds like the Diode or the Voltage Regulator is going out on the alternator. I would recomend replacing soon. When one of those 2 componets go out, it really over heats the alternator. This causes the bearings on the back side of the alternator to fail, and sieze. This has cause some fires in GM cars and trucks.