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Is the voltage regulator a part of the alternator?

Tiny
CATLVR_214
  • MEMBER
  • 1998 NISSAN ALTIMA
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
Hello, I have a question regarding my car. Having problems starting the car, so I took the car to AutoZone and they tested the entire charging system and they determined it was the voltage regulator. My question is: is the voltage regulator a part of the alternator?

Thank you!
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Tuesday, February 7th, 2017 AT 2:57 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,727 POSTS
Yup. It is built in on most models except for Chrysler's, so you have to buy more than you need.

What is your battery voltage while the engine is running?
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Tuesday, February 7th, 2017 AT 3:44 PM
Tiny
CATLVR_214
  • MEMBER
  • 2 POSTS
Thanks! It registered a 13 when tested at auto zone. I just had the alternator replaced at a shop. I just wanted to make sure it was part of the alternator and not a separate part.
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Tuesday, February 7th, 2017 AT 3:49 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,727 POSTS
The acceptable range is 13.75 to 14.75 volts. There are other tests to determine if the generator is causing the low voltage or if there is a wiring problem, but those tests require a professional load tester. Specifically, "full-load output current" and "ripple voltage" are what I want to see.
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Tuesday, February 7th, 2017 AT 3:53 PM

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