Page 1 of 2 12 LastLast
Results 1 to 20 of 26

what can cause my alternator to do this?

This is a discussion on what can cause my alternator to do this? within the External Engine forums, part of the LSx Technical Help Section category; When i first start my car in the morning my charging gauge stays low and will stay low until i ...

  1. #1
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    what can cause my alternator to do this?

    When i first start my car in the morning my charging gauge stays low and will stay low until i rev it to 2k rpms and then when i drive it drops once and then charges fine throughout the day ?

  2. #2
    Member Blue28's Avatar
    Join Date
    Nov 2007
    Location
    Ca.
    Posts
    769

    Navy Blue
    1999 Camaro Z28

    Do you have a UD crank pulley on your car?

  3. #3
    Member Blue28's Avatar
    Join Date
    Nov 2007
    Location
    Ca.
    Posts
    769

    Navy Blue
    1999 Camaro Z28

    UD crank pulley?...??.....?

    If you do have a UD crank pulley:

    Your alt. needs to reach set rpm before it'll will turn on, then it'll stay on until you turn your car off . If you have a UD crank pulley your normal idle speed(RPM) will now will be to low to turn it on; so that's why you have to rev it to get the alt. to turn on.

  4. #4
    Senior Member
    Join Date
    Jan 2010
    Location
    texas
    Posts
    1,621

    silver
    2000 formula

    alt going out?

  5. #5
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    no everything is stock and it is a brand new alternator

  6. #6
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    i had them test it at advanced but when i started it and it charged fine, it didnt drop at all and the scan said it was in perfect shape we even did load tests and everything turned out good

  7. #7
    Senior Member MrMasterCraft's Avatar
    Join Date
    Nov 2009
    Location
    NOVA
    Posts
    1,266

    2002 C5 - M6 - Blue
    2000 Z28 - A4 - Pewter

    Quote Originally Posted by Firebirdformula View Post
    i had them test it at advanced but when i started it and it charged fine, it didnt drop at all and the scan said it was in perfect shape we even did load tests and everything turned out good
    Only 2 possible reasons I can think of, off hand

    1) Gauge is faulty. Never heard of one going bad, but it's possible

    2) I've had 2 bad alternators check out fine, but have still been bad. Don't ask me how, and you can even call me a liar, but it's happened. Is it a NEW NEW alternator or a Re-Manufactured alternator? I think there's a regulator inside that could possibly be giving you some trouble, especially if it's a re-man...

    Just my two cents...

    2000 Z - Light Pewter Metallic - A4 - 130k - Bolt Ons - My Pride and Joy
    2002 C5 - Electron Blue - M6 - 32k - My Dream Car

  8. #8
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    its a rebuilt one, but they rebuilt my last one and it was great until my powersteering leaked on it, which is why they rebuilt it again

  9. #9
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    it has all new parts in it

  10. #10
    Member xmarkx's Avatar
    Join Date
    Mar 2010
    Location
    EAST bay area Cali
    Posts
    634

    black
    1999 camaro SS

    my PS leaked alot of fluid on my alt and it still works....

  11. #11
    Senior Member MrMasterCraft's Avatar
    Join Date
    Nov 2009
    Location
    NOVA
    Posts
    1,266

    2002 C5 - M6 - Blue
    2000 Z28 - A4 - Pewter

    Quote Originally Posted by xmarkx View Post
    my PS leaked alot of fluid on my alt and it still works....
    On my red WS6, I went through 4 alternator swaps until I narrowed the problem to a leaking PS pump. Don't ask my why or how I didn't notice any fluid on all those R&Rs. But I was swapping every 6 months. I think it was the hose

  12. #12
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    ya man im bout to say scew it and go to manual steering, andmark your alternator will go out eventually thats what my last one did, it leaked on it then i fixed the leak and then later opn the alternator started spiking and dropping

  13. #13
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
    Join Date
    Feb 2009
    Location
    Pittsburgh
    Posts
    9,965

    White
    2008 Hummer H3

    Wink

    Quote Originally Posted by MrMasterCraft View Post
    Only 2 possible reasons I can think of, off hand

    1) Gauge is faulty. Never heard of one going bad, but it's possible

    2) I've had 2 bad alternators check out fine, but have still been bad. Don't ask me how, and you can even call me a liar, but it's happened. Is it a NEW NEW alternator or a Re-Manufactured alternator? I think there's a regulator inside that could possibly be giving you some trouble, especially if it's a re-man...

    Just my two cents...
    Nope you're no lier. As a former rebuilder for an automotive shop I know exactly what you're talking about..
    Quote Originally Posted by Firebirdformula View Post
    it has all new parts in it
    Don't hold your breath.... @ the shop I worked @ we used to venier(sp) the old parts that checked out good.. Many folks think they are getting a remanned part with all new internals.. The real truth (NOT calling you a lier @ all) is rebuild shops rarely use all new stuff.. It may look like all new parts from just looking through the vent holes but it's highly doubtfull. Rebuild shops don't make as much money on an old unit with all new internals. Most shops operate under this premis. You could easily have a nice piece of remanned sh&t and never be the wiser. Not all shops use professional rebuilders either, infact most shops only have ONE head rebuilder and all the other folks work under him.. I've worked with "rebuilders" that could'nt even read an ohm/volt meter and did'nt have any understanding of what they were looking/for such as diode trio test readings, com and stator tests. Many over mill the rotor com on the lathe too, instead of just throwing a rotor with an overly worn com out.. Most rebuild shops also fill their units with Hocheemin parts too, meaning the only thing still from Delphi is the housing, everthing else is from China = many defective "new" parts.. Could be something as simple too as an isolator for internal screws and bolts got over tightened, or an old damaged one got reused before they caught it, and even possible the the rebuilder did'nt bother using them. Then off to the test bench for a 10 second check and load test.. Then you get the unit installed on your car where it's expossed to wheather and constant load, and the problem starts again or there are a whole new set of problems that arise.. Bottom line is it's hit or miss with rebuilds .. If you can I would have to say always buy a new unit. Or have the senior rebuilder specifically rebuild the unit.. The older guys tend to never use the phrase, "thatel work!" and usually will build the unit to the proper requirements.. I've personally pulled units apart that where supposed to have a certain amperage rated stator only to find a reused antique stator for a lesser amprage Alt, nice huh?
    Last edited by Smittro; 06-19-2010 at 05:59 AM.
    :\Users\Steven\Pictures\d6ftg5nh.gif


    Suggestion: If you are particularly irritated by another member's posting habits and are constantly fighting the urge to flame them, you can click on that person's profile, and select "Add to ignore list." This will make that person's posts invisible to you.

  14. #14
    Senior Member
    Join Date
    Jan 2010
    Location
    texas
    Posts
    1,621

    silver
    2000 formula

    ^^^^ the reason i am gunna rebuild my own........parts are not that expensive.......piece of mind is priceless

  15. #15
    Member xmarkx's Avatar
    Join Date
    Mar 2010
    Location
    EAST bay area Cali
    Posts
    634

    black
    1999 camaro SS

    Quote Originally Posted by Firebirdformula View Post
    ya man im bout to say scew it and go to manual steering, andmark your alternator will go out eventually thats what my last one did, it leaked on it then i fixed the leak and then later opn the alternator started spiking and dropping
    probably later rather than sooner because I rarely drive it.. maybe once every week and a half

  16. #16
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    haha ya hopefully you get longer out of yours then i did mine but mine leaked a whole reservoir on it

  17. #17
    Auto Painter RyanJM's Avatar
    Join Date
    Dec 2007
    Location
    Houston, TX
    Age
    41
    Posts
    2,002

    White
    1998 Trans Am

    Have to check my PS for leaks. My 220amp alternator wasn't cheap and I don't need a headache. I got it after wasting time with AZ crap since it didn't like my UD crank pulley even with the OD alt pulley. This alternator was worth every penny, no power loss no matter what is on.
    1998 Trans Am 85k miles.
    Bolt ons, MS3 113LSA cam, Circle D Stall, Tune, Modified WS6 style hood, Full Suspension, 6000k HID's, Clear Side Markers w/ Leds, Led 3rd Brake Light and 18" AR Staggered Killer Wheels w/ BFG KDW NT's.- Weekend Toy/DD
    02 Trailblazer -Sold
    09 Ram 1500 CC - Sold
    09 Cobalt SS/TC - Sold
    13 ram 1500 LoneStar CC 4x4 - Magnaflow, K&N,and more to come-DD/Toy

  18. #18
    Member jamessr's Avatar
    Join Date
    Jan 2007
    Location
    Newport News, VA
    Posts
    266

    White
    2000 Trans AM

    For what its worth, put a multi meter on it and see for sure what you're getting. I know my gauge shows at times only 10VDC dropping up and down... I put a meter on it and I get 14.85VDC steady.
    I'm happy with that

  19. #19
    Member Firebirdformula's Avatar
    Join Date
    Feb 2009
    Location
    oklahoma
    Posts
    146

    black
    2000 firebird formula Ws6

    alright i will, its now staying in the in the 10volt area =(

  20. #20
    Member damianj03's Avatar
    Join Date
    May 2009
    Location
    saint robert, mo
    Posts
    265

    slap your mama red
    1998 trans am

    was told by my instructor that the battery starts the car and runs all of the accessories also while the car is running and the only job of the alternator is to recharge the battery so you could have a low battery that is only taking a partial charge. just tryin to help

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Alternator help
    By GOHOME! in forum General Help
    Replies: 3
    Last Post: 06-06-2009, 12:18 PM
  2. Need Help With Alternator!!
    By camarossf650 in forum General Help
    Replies: 11
    Last Post: 03-20-2009, 06:42 AM
  3. Alternator Help
    By Chamelion WS6 in forum General Help
    Replies: 4
    Last Post: 12-16-2006, 09:13 AM
  4. alternator
    By a10beav in forum GTO
    Replies: 2
    Last Post: 09-26-2006, 09:39 AM
  5. lt1 ALTERNATOR
    By drb131s in forum Parts For Sale / Trade
    Replies: 0
    Last Post: 09-17-2006, 05:16 PM

Bookmarks

Posting Permissions

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