Need an alternator. Which one?

[TireFryer]

I need an alternator. Only have 12.4 volts at wot and don't want any of those "voltage boosters". Who rebuilds them or where do I get one that will work properly? Anything special about our alternators or can I just go get one from autozone?

 

[TIMINATOR]

Ours are typically 120-140 amp, and should make 13,8+ at RPM.
Make sure it's got a good ground, and cables, then have it checked.
TIMINATOR

 

['87 Turbo "T"]

If you have the option(rare I know) find a reputable shop around you that can rebuild your original.

I got mine rebuilt(turned out brushes were still pretty decent) & upped to 140A. Cost less than the Chinese crapshoot you get nowadays.

Just my suggestion.

 

[626gn]

I need an alternator. Only have 12.4 volts at wot and don't want any of those "voltage boosters". Who rebuilds them or where do I get one that will work properly? Anything special about our alternators or can I just go get one from autozone?

If you're currently running a factory alternator, one commonly overlooked difference is most aftermarket alternators will come with a different size pulley than your factory unit.

 

[~JM~]

I bought one of these: 200 AMP ALTERNATOR KIT-LATE VERSION DELCO CS144 ALTS-CHEVY,HUMMER, PONTIAC GMC | eBay

I have not rebuilt the alternator yet though. If you decide to go this route, contact the seller to help ID which bearing size you need for your cases.

The aftermarket alternators have incorrect pulley diameter.

 

[Chuck Leeper]

Our local shop has more than 1 grade of repair parts. We always ask for "the good stuff".

 

[chopped39]

I used the 96 Impala ss alternator.

 

[TireFryer]

I used the 96 Impala ss alternator.

Which one? something like this? Does it just plug right in? Trying to get back up and running quickly. Car is adding a lot of fuel as the voltage is way low. https://www.autozone.com/batteries-...tor/p/valucraft-alternator-1386-6-7/13522_0_0

 

[BEATAV8]

I recently got a Remy unit from Rockauto. $80 and it’s perfect. 14.2 volts

 

[TireFryer]

I recently got a Remy unit from Rockauto. $80 and it’s perfect. 14.2 volts

A buick or impala one?

 

[BEATAV8]

A buick or impala one?

Buick. Looks just like original

 

[BEATAV8]

 

[TireFryer]

I'll order one up

 

[TireFryer]

Buick. Looks just like original

Are you getting that 14.2 volts at speed warm? My alternator puts out 13.8 at startup and falls to 12.2 as it warms up.

 

[BEATAV8]

Are you getting that 14.2 volts at speed warm? My alternator puts out 13.8 at startup and falls to 12.2 as it warms up.

Just went for a spin in the goonie wagooon to check it.
Looks like 14.5-14.6V warmed up in vacuum:

And 14.3V in boost:

 

[Nigel]

I would read post #14 and #18 in the following link before replacing your alternator. If you still have poor voltage, then consider the alternator.
Alternator upgrade

 

[BEATAV8]

I threw a casper volt booster on that remy alternator today and it definitely responds. 16.6 volts yowza!

 

[Phoneguy]

I went with a Powermaster from Summit after going through several units from Autozone that would drop voltage at anything over 5000. The unit I bought has an adjustable voltage regulator that will go to 17 volts. Expensive but...

Bryan

 

[Mr.Spool]

the battery and fuel pump combo you wish to run in some circumstances must be looked at.
If you are running a lithium battery I know antigravity doesn't want any more alternator capability higher than stock.

 

[Mr.Spool]

I would also be careful about running higher voltage to certain pumps as well.
The really high end pumps don't need alot of voltage also and supply all the fuel the car will ever need