Battery or Alternator problem?
+ Reply to Thread
Results 1 to 7 of 7

This is a discussion on Battery or Alternator problem? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; First of, at night as my car is idleing, ill notice that the headlights (light) and interior lights dim out ...

  1. #1
    Registered User ezzzey's Avatar
    Join Date
    Apr 2006
    Posts
    549

    Battery or Alternator problem?

    First of, at night as my car is idleing, ill notice that the headlights (light) and interior lights dim out a litte, like its loosing energy sorta speak. Also if i rev up the lights also go brighter (by a very small amount thou, no biggy).
    *Anyone ever experience anything like that?

    Also..

    Anytime i leave my car somehwere for about... 10mins with the emergency lights on(4way's), the battery is practically drained, and twice its already happened where after 10 minutes, i cant start the car. Battery is like gone. !! Could it be my battery is bad and it doesnt charge properly, so it discharges so fast? OR the alternator is weak and doesn't properly charge it?
    Last edited by ezzzey; 04-21-2007 at 09:03 PM.

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #2
    Registered User Excelsior-T's Avatar
    Join Date
    Apr 2007
    Location
    O'fallon, IL (STL area)
    Posts
    28
    I have the same problem with my car, my guess is its your alternator, but I have also heard that it could be the voltage regulator.

    dunno, my car's a 36 year old dodge, so the systems might be substantially different
    Who needs signatures?

  4. #3
    Registered User bcyb1029's Avatar
    Join Date
    Feb 2006
    Location
    Chicago
    Posts
    3,021
    Take your battery and alt. to autozone and get them tested, its free.
    Tuned by Jorge at P&L, 240.83whp 239.60wtq at 14.8psi on 2.0L with stock td04 (But doesn't run)

  5. #4
    Registered User ezzzey's Avatar
    Join Date
    Apr 2006
    Posts
    549
    Quote Originally Posted by bcyb1029 View Post
    Take your battery and alt. to autozone and get them tested, its free.

    yea ill get it go tested... dont know of anyone that does it free thou... im in toronto, so no autozone ;/

  6. #5
    Registered User
    Join Date
    Dec 2006
    Posts
    57
    Get a voltmeter or just get a multimeter and check the voltage of the battery when the car is running and when it's not.
    If the voltage is anywhere around 14.4 volts while running, your alternator is just fine. When the car is off, if the battery voltage is around 12.5 you're fine.
    The stock alternators on these cars (as is the case with most 4 cyls) are next to worthless if you plan on adding anything electrical in addition to the stock electrical system.
    From the sound of it though, your battery is probably toast, since you say it won't hold a charge. If your engine-running voltage is around 14.4 but the battery won't hold a charge, that pretty much confirms it.
    The first thing I did to my car when I got it was:
    A) Upgraded my battery to a deep cycle/dry cell
    B) Upgraded my wires going from my alt to my battery, starter to my battery, and the battery ground. I didn't replace them (as the stock lines typically have fuses and relays and **** in line them that you don't want to mess with), I just put these wires in addition to what was already there.
    It's a pretty standard/common upgrade, but infinitely important in my opinion. Particularly with the grounds. People often don't realize the importance of good grounding, and stock grounds on a lot of vehicles electrical systems are pretty pathetic. Including Subies' grounds. At least mine were.
    Get a quality battery, some beefy wire, ground to some frame and upgrade the rest of the aforementioned wires; and I can pretty much guarantee the difference will be night and day.

  7. #6
    Registered User
    Join Date
    Oct 2006
    Posts
    275
    Sounds like battery. Autozone told me my alternator was shot and I took the car to a honda specialist because if I left the car turned off for more than about 5 minutes I'd require a jump start, even after a nice long drive. The specialist said it was the battery, I had it changed and my car hasn't died since (been months now).

    I guess what had happened was that the battery was going on 7 years old, and even with the alternator trying to recharge it the battery just couldn't hold the charge. I was told that if the alternator was the problem you would find yourself stalling in traffic and what not. My car never stalled, just wouldn't start if I left it off for a few minutes. It was a very crappy day because I had to get jump started 4 times and make about 5 phone calls before I got the problem fixed.

  8. #7
    Registered User Decon's Avatar
    Join Date
    Feb 2006
    Posts
    861
    Quote Originally Posted by ezzzey View Post
    First of, at night as my car is idleing, ill notice that the headlights (light) and interior lights dim out a litte, like its loosing energy sorta speak. Also if i rev up the lights also go brighter (by a very small amount thou, no biggy).
    *Anyone ever experience anything like that?

    Also..

    Anytime i leave my car somehwere for about... 10mins with the emergency lights on(4way's), the battery is practically drained, and twice its already happened where after 10 minutes, i cant start the car. Battery is like gone. !! Could it be my battery is bad and it doesnt charge properly, so it discharges so fast? OR the alternator is weak and doesn't properly charge it?
    The flicker is the alt, but other thing is you need a new battery. Its not holding charge. But as far as the Alt thing U should be fine. But if u want to test it the ez way. Turn on your car, take off the neg on the battery and if car is still running good your alt is good.

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself. We strongly suggest that you stay away from using aol, yahoo, msn, and hotmail accounts. Sometimes the mail server blocks the emails from our server. As a result you will not receive any notifications including the confirmation email.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •