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 Alternator Voltage

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BuickRivieraGeorgia
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Name : Riviera
Joined : 2021-03-24
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Alternator Voltage Empty
PostSubject: Alternator Voltage   Alternator Voltage EmptyWed Mar 24, 2021 9:12 am

Hi all

I have registered here again after many years.
My car is located in Tbilisi, Georgia and I just got back and want to revive my favourite car in the world!
My issue is the red battery light on the left and I am guessing it is the alternator- since the battery keeps dying.
Obviously, I cannot buy a new one in this country...
But there is a guy that can rebuild it, but I am not sure I trust his knowledge of the proper voltage for a 95 supercharged one.
What would be the correct voltage to rebuild it for?
And also, I read it here that it could be a thermistor issue as well, is that also the case for a 95? And if so, how to deal with it?

PS
Alternator is my first guess, but if there any other common issues - would love to hear it

Thanks!
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LARRY70GS
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LARRY70GS

Name : Larry
Age : 64
Location : Oakland Gardens, NY
Joined : 2007-01-23
Post Count : 1980
Merit : 129

Alternator Voltage Empty
PostSubject: Re: Alternator Voltage   Alternator Voltage EmptyWed Mar 24, 2021 11:59 am

The alternator is internally regulated. It is a 12 volt alternator that will charge the battery between 14 and 14.6 volts depending on load and temperature. Any rebuilder can refurbish the alternator. They replace common parts. The output voltage will vary according to need. It isn't something a rebuilder adjusts.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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BuickRivieraGeorgia
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Name : Riviera
Joined : 2021-03-24
Post Count : 8
Merit : 0

Alternator Voltage Empty
PostSubject: Re: Alternator Voltage   Alternator Voltage EmptyWed Mar 24, 2021 1:20 pm

LARRY70GS wrote:
The alternator is internally regulated.  It is a 12 volt alternator that will charge the battery between 14 and 14.6 volts depending on load and temperature.  Any rebuilder can refurbish the alternator.  They replace common parts.  The output voltage will vary according to need.  It isn't something a rebuilder adjusts.

I see, so it should put out 12 volts, but then the thermistor makes it give out 14-14.6

Thanks for your reply!
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LARRY70GS
Aficionado
LARRY70GS

Name : Larry
Age : 64
Location : Oakland Gardens, NY
Joined : 2007-01-23
Post Count : 1980
Merit : 129

Alternator Voltage Empty
PostSubject: Re: Alternator Voltage   Alternator Voltage EmptyWed Mar 24, 2021 1:21 pm

BuickRivieraGeorgia wrote:
LARRY70GS wrote:
The alternator is internally regulated.  It is a 12 volt alternator that will charge the battery between 14 and 14.6 volts depending on load and temperature.  Any rebuilder can refurbish the alternator.  They replace common parts.  The output voltage will vary according to need.  It isn't something a rebuilder adjusts.

I see, so it should put out 12 volts, but then the thermistor makes it give out 14-14.6

Thanks for your reply!

The internal regulator and thermistor determine output voltage according to need. In order to charge a 12 volt battery, the charging voltage has to be at least 13.8 volts. This is true of any 12 volt system alternator.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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BuickRivieraGeorgia
Newbie


Name : Riviera
Joined : 2021-03-24
Post Count : 8
Merit : 0

Alternator Voltage Empty
PostSubject: Re: Alternator Voltage   Alternator Voltage EmptyWed Mar 24, 2021 2:06 pm

LARRY70GS wrote:
BuickRivieraGeorgia wrote:
LARRY70GS wrote:
The alternator is internally regulated.  It is a 12 volt alternator that will charge the battery between 14 and 14.6 volts depending on load and temperature.  Any rebuilder can refurbish the alternator.  They replace common parts.  The output voltage will vary according to need.  It isn't something a rebuilder adjusts.

I see, so it should put out 12 volts, but then the thermistor makes it give out 14-14.6

Thanks for your reply!

The internal regulator and thermistor determine output voltage according to need.  In order to charge a 12 volt battery, the charging voltage has to be at least 13.8 volts.  This is true of any 12 volt system alternator.

So, is the 1995 Riviera alternator supposed to put out 13.8 or 14.0 or 14.6?
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LARRY70GS
Aficionado
LARRY70GS

Name : Larry
Age : 64
Location : Oakland Gardens, NY
Joined : 2007-01-23
Post Count : 1980
Merit : 129

Alternator Voltage Empty
PostSubject: Re: Alternator Voltage   Alternator Voltage EmptyWed Mar 24, 2021 2:16 pm

BuickRivieraGeorgia wrote:
LARRY70GS wrote:
BuickRivieraGeorgia wrote:
LARRY70GS wrote:
The alternator is internally regulated.  It is a 12 volt alternator that will charge the battery between 14 and 14.6 volts depending on load and temperature.  Any rebuilder can refurbish the alternator.  They replace common parts.  The output voltage will vary according to need.  It isn't something a rebuilder adjusts.

I see, so it should put out 12 volts, but then the thermistor makes it give out 14-14.6

Thanks for your reply!

The internal regulator and thermistor determine output voltage according to need.  In order to charge a 12 volt battery, the charging voltage has to be at least 13.8 volts.  This is true of any 12 volt system alternator.

So, is the 1995 Riviera alternator supposed to put out 13.8 or 14.0 or 14.6?

It's variable. No alternator puts out ONE voltage. The voltage will vary according to needs. There is no need for worry or concern about voltage. I am sure your guy can rebuild your alternator and it will be fine.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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