Alternator replacement

Tiny
GEORGIE MILLER
  • MEMBER
  • 1995 BUICK CENTURY
  • AUTOMATIC
  • 150,000 MILES
What tools needed for removing an alternator? What size sockets and wrenches?
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Monday, October 17th, 2016 AT 2:00 PM

10 Replies

Tiny
HMAC300
  • EXPERT
13 and 15 mm. Here is a guide that can help you see what you are in for when doing the job:

https://www.2carpros.com/articles/how-to-replace-an-alternator

Please let us know if you need anything else to get the problem fixed.

Cheers
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Monday, October 17th, 2016 AT 3:21 PM
Tiny
NATELIENN
  • MEMBER
  • 1994 BUICK CENTURY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Hello, just got this car from someone I know. They said the alternator was just replaced, the battery seems to be new and seems to hold a charge pretty well. When I charge the battery then start the car, the voltage will start out normal (14 volts). Over the course of a couple minutes, the voltage steadily drops, even if I am revving the engine, until it finally shuts off.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
OBXAUTOMEDIC
  • EXPERT
Hello,

You will need to have the charging system checked. If you have a DVOM you can check to see if the alternator is charging. If not go by your local auto parts store and have them check most will do it free.

Check out this link if you want to test it yourself.

http://www.2carpros.com/how_to/how_to_test_alternator.htm

.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
To add check both fuse and wiring -see below.


http://www.2carpros.com/forum/automotive_pictures/12900_fuses_6.jpg

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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
NATELIENN
  • MEMBER
Okay, I have checked out the alternator and battery, both are in near perfect condition. It seems that when I turn on my lights, that is when the drain happens. Before the car was given to me, the front driver side was damaged in an incident. I disconnected all harnesses to each headlight/brights. The meter reads about 14.00 volts +/-.02. On the passenger side, when headlight is connected, it goes down to 13.30. When passenger bright is connected, goes down to 13.00. When driver headlight is connected, goes down to 12.95. When driver bright is connected, goes down to 12.80. This is all while revving the engine. Are these normal voltages? I now remember the car first shutting off on me while using the headlights. I have not connected all the harnesses at the same time yet, I just did individual.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Could be some resistances dropping the voltage a bit but for me its normal. Or you can go higher output alternator to keep up with the load.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
NATELIENN
  • MEMBER
Well, I did some more playing around and it turns out. I do not know. The alternator will go up to 14 volts, but when I idle the car, it can sometimes go down to 12.00, usually around 12.40. Is that normal for idling? This is with the lights off.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
GOODOLDJR98
  • MEMBER
  • 1995 BUICK CENTURY
144 000 miles.

As I was driving a heard a sudden low pitch whine coming from the passenger side of the car. When I tapped the brake all power shut down for a split second and then came back on (no whining noise). When I got home I shut off the car. It had no power at all after that. I am guessing this may be the alternator. Does that sound right? Also, can an alternator that is going bad cause random weak acceleration?
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
MERLIN2021
  • EXPERT
You can take it off and go to AutoZone, they test them for free.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Sounds like the internal voltage regulator is not controlling the field winding. Pull the alternator again and get it reload tested

A good battery will read above 12.4 volts with no load on it. Try this disable the ignition system and crank engine over for ten seconds if it does not hold up 9.5 volts replace the battery.
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Monday, September 24th, 2018 AT 2:51 PM (Merged)

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