Alternators life [Archive] - GrandAmGT.com Forum

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zelda4325
07-29-2005, 09:51 AM
I just had my alternator replaced after 36,600 miles of course a week or so after the warrenty expired. My question is what is the life expectencie of an alternator. If this is short, could it have been caused by my subwoofer. its only 300 rms, but i have it bumping the whole time in the car. is there aything I could do to extend the life of them.

Matt95GT
07-29-2005, 10:02 AM
Alternators are one of those parts in a car that break easily/often when aftermarket electronics are present. I'm on #5 or #6 on my 95... they are my nemesis.

Other than removing the stereo, keeping batt terminals clean and using a strong battery (Optima) there isn't much you can do.

freakydeaky
07-29-2005, 10:24 AM
I just had my alternator replaced after 36,600 miles of course a week or so after the warrenty expired. My question is what is the life expectencie of an alternator. If this is short, could it have been caused by my subwoofer. its only 300 rms, but i have it bumping the whole time in the car. is there aything I could do to extend the life of them.

a good strong battery is key..... i would say you can expect 2-3 years or approx. 50,000 miles

dj2229
07-29-2005, 10:36 AM
My Alternator lasted me 125,000 miles or 6 years

freakydeaky
07-29-2005, 11:45 AM
My Alternator lasted me 125,000 miles or 6 years

he has alot of mods that is eating up his power though

coupe
07-29-2005, 11:53 AM
Mine lasted 60K i have no aftermarket electronics other than guages and CFS. Still using my stock original AC delco battery.

Coop
07-29-2005, 01:19 PM
As already stated electronics put a strain on the charging system, a sub will definately have some bearing on the life expectancy of the alternator.

One word of advice though - DO NOT BUY AN ALTERNATOR AT AUTOZONE!!!!! If you do you may as well just keep a spare cause you'll be replacing it every week.

jeffescortlx
07-29-2005, 01:20 PM
The one in my 95 died right when I got it at 60k. I had it rebuilt, and it now still fine with 143k. It's had about a 200 Watt RMS amp on it shortly after I got it.
There easy to replace.

Chemboy
07-29-2005, 01:48 PM
I ran a 300 watt RMS amp on mine for about 2 years. Currently I am not running anything but I still have the factory battery and alternator and the car has 111,000 miles.

Matt95GT
07-29-2005, 02:29 PM
One word of advice though - DO NOT BUY AN ALTERNATOR AT AUTOZONE!!!!! If you do you may as well just keep a spare cause you'll be replacing it every week.

Agreed... rebuilt alternators in general should be avoided. In other words, Pep Boys is no better. (only 4,000 miles, pop, grrrrrrrr)

AleroME
07-29-2005, 02:52 PM
Autozone sells new ones now for like 10-20 bucks more than the rebuilt one with lifetime warranty. Mine and my bro alero has them and we got like 60k out of the new duralast aternator .. not the rebuilt ones.

DevilSlayer
07-29-2005, 06:29 PM
My original alternator died at 75k miles. I got a rebuilt one at pepboys and 13k miles later its still running fine with an Optima Red Top (got it after the alternator died. If this one dies would a MSD high output alternator be a good idea? btw, whats the output of the stock alternator?

MSD alternator at Jegs (http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=384521&prmenbr=361)

Mike Jung
07-29-2005, 07:15 PM
...whats the output of the stock alternator?...

105 Amps

MetaGTP1
07-29-2005, 08:05 PM
My alternator lasted 4 1/2 years. :gagreen:

zelda4325
07-29-2005, 09:52 PM
i had no choice but to by a refurb one from autozone because i was stuck 100 miles away from home that was the only one availible

GrandAmGT1996
07-29-2005, 10:32 PM
The only thing that I can suggest is going out and buying a capacitor which could possibly help save your alternator. Except anywhere from $90-130. Thats the only other thing that I could think of.

Edit: If you don't know what a capacitor is, its something that stores energy for your system...so when the bass is really hitting it supplies enough power. Oh yeah...do your headlights dim at all when you really have it thumping?

Mike Jung
07-29-2005, 10:38 PM
The only thing that I can suggest is going out and buying a capacitor which could possibly help save your alternator...

:nono:
More like, kill your alternator faster.


Dimming lights/low voltage question's.... (http://www.grandamgt.com/forum/showthread.php?t=3278)

GrandAmGT1996
07-29-2005, 10:47 PM
lol, yeah that would make sense (after reading your link). My bad...but once you fix the problem and its running good....then consider a cap. lol

zelda4325
07-30-2005, 02:35 AM
the lights were dimming when i had the old alternator but were doing that for a while back.
So now that i got the new alternator and new battery should i get a cap. aif so which one?

coupe
07-30-2005, 09:33 AM
I have never bought a new alternator in the 6 cars i have owned since i was 16. Everyone one of those cars alternators died on me. I have never had a problem with rebuilds.

GrandAmGT1996
07-30-2005, 11:27 AM
Well you could probably get a .5 farad capacitor, i have a mobile spec, but just shop around...i think rockford fosgate has one out...thats a good company.

Ajaxus
07-30-2005, 01:12 PM
I ran a 300 watt RMS amp on mine for about 2 years. Currently I am not running anything but I still have the factory battery and alternator and the car has 111,000 miles.

you touched on what i wanted to cover. the 300w rms sub should not be putting too great of a strain on the alternator/battery. but if you want to feel better, like grandam1996 said, get a 0.5 farad capacitor. if you do get a cap, i recommend having someone else install it or doing the research first, if done incorrectly it has the potential to fry your entire audio system. its better to have a pro do this and sue them than to do it yourself and pay out of your wallet. the cap will act 'basically' like a second battery. when your sub hits, it will take the power from the cap and then the cap will instantly be recharged by the battery. this should take alot of stress off of the rest of your electrical.

you dont necessarily need a cap, but it would help lessen the strain on your electrical in your car. alternators like said before go bad quite easily, but some people get lucky as well and have their stockers for a long time. a cap might remedy future problems, and it might not. no guarantees, because alternators are not so reliable.

hope this helps some.