1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

lights dim or intensify according to rpm's

Discussion in 'General Tech and Maintenance' started by sbaker0421, Jan 12, 2004.

  1. sbaker0421

    sbaker0421 Junior Member

    Messages:
    9
    Likes Received:
    0
    Joined:
    Jan 12, 2004
    For the past couple of months my interior and exterior lights have been intensifying or dimming according to the rpms. All lights stay at the their brightness while I'm driving. They dim when the idle drops down past 1000-1200 rpm. Have replaced spak plugs/wires/distrib cap/ and rotor. I also put new battery in it and didin't change anything. Can someone help me? Thanks
     
  2. B16

    B16 Super Moderator VIP

    Messages:
    11,539
    Likes Received:
    534
    Joined:
    Sep 30, 2002
    Location:
    yay area, CA
    alternator going bad maybe?
     
  3. 2fastaccord

    2fastaccord Senior Member

    Messages:
    538
    Likes Received:
    0
    Joined:
    Dec 30, 2002
  4. Jeef

    Jeef NO MA'AM Moderator VIP

    Messages:
    7,152
    Likes Received:
    294
    Joined:
    Sep 29, 2002
    Location:
    CT
    Also check your battery terminals.
     
  5. 97CTR

    97CTR Senior Member

    Messages:
    745
    Likes Received:
    0
    Joined:
    Jul 10, 2003
    alternator, or tension on your alternator belt
     
  6. IDMaxGuy

    IDMaxGuy Senior Member

    Messages:
    1,479
    Likes Received:
    2
    Joined:
    Apr 8, 2003
    Location:
    MO
    battery or alternator, also make sure connections are good...
     
  7. shootNOS

    shootNOS Junior Member

    Messages:
    18
    Likes Received:
    0
    Joined:
    Jan 3, 2004
    Location:
    tacoma wa
    could be a bad ground maybe.
     
  8. mwvnos

    mwvnos Senior Member

    Messages:
    811
    Likes Received:
    0
    Joined:
    Oct 27, 2002
    Location:
    SC
    could be your alternator but i wouldnt worry to bad about it yet....its prolly just that your alt isnt spinning fast enough to get alot of power going at that low rpm engine speed....does that to me too...
     
  9. Magik

    Magik Senior Member

    Messages:
    158
    Likes Received:
    0
    Joined:
    Nov 26, 2003
    Location:
    Moncton, New Brunswick CANADA
    Mine does that...when I turn my headlights on I can hear my engine slow a little, then I turn on the heater, slows a little more...the engine is just working harder with the more things that you turn on...when I come up to speed my engine powers everything up to full capacity and away I go...

    Jason
     
  10. UDT

    UDT Senior Member

    Messages:
    2,015
    Likes Received:
    0
    Joined:
    Sep 24, 2003
    Location:
    california
    basicly there all good ideas if you are going to try to solve the problem, try all the methods that dont envolve you buying anything then wrok your way up, basicly trouble shoot with the all the different ideas just thrown at you and start with the most easy and cheapest things first.;
     
  11. solblu

    solblu Senior Member

    Messages:
    378
    Likes Received:
    0
    Joined:
    Jan 17, 2003
    Location:
    Ricer
    It's definately an alternator problem. If the belt is tight start shopping for a new one.

    FYI any parts store will load test it and you will know for sure.
     
  12. Hatch-R

    Hatch-R Member

    Messages:
    53
    Likes Received:
    0
    Joined:
    Dec 17, 2003


    :werd: :withstupid:
     
  13. TWAN

    TWAN Senior Member

    Messages:
    374
    Likes Received:
    1
    Joined:
    Dec 11, 2003
    Location:
    Washington
    Do you have under drive pullys?
     
  14. Loco Honkey

    Loco Honkey Banned

    Messages:
    3,646
    Likes Received:
    0
    Joined:
    Jun 5, 2003

    I disagree. Let's look at how an automotive electrical system works...

    Basically, the alternator serves as the primary electrical source, with the battery taking up the extra load when it needs to. The battery's main purpose is to start the car, and on occasion (idle with every electrical device on), help the alternator supply power.

    Now, if the lights dim at low RPM, but are bright above 1500 RPM or so, the alternator is most definetly doing it's job, and it's the battery that is not. Load test the battery and I'm willing to bet my car that you have a bad battery.
     
  15. B16

    B16 Super Moderator VIP

    Messages:
    11,539
    Likes Received:
    534
    Joined:
    Sep 30, 2002
    Location:
    yay area, CA
     
  16. Loco Honkey

    Loco Honkey Banned

    Messages:
    3,646
    Likes Received:
    0
    Joined:
    Jun 5, 2003

    hah...

    Loco Honkey's reading comprehension skills = Unsatisfactory.

    *puts on dunce cap and sits in the corner*
     
  17. MikeBergy

    MikeBergy Blah blah blah....

    Messages:
    3,646
    Likes Received:
    1
    Joined:
    Oct 9, 2003
    Location:
    Central Coast, CALI
    Also if you have a bumpin stereo, but no capacitors, It will sometimes do this. My friend's civic had that problem. It also dimmed the lights when ever a hardhitting song was playing. The lights would dim to the beat of the music.
     
  18. Def_Jam

    Def_Jam Senior Member

    Messages:
    347
    Likes Received:
    1
    Joined:
    Sep 12, 2003
    Location:
    Wilmington, NC
    couldnt a bad or loose ground wire case this?
     
  19. Hatchbacks Anonymous

    Hatchbacks Anonymous Senior Member

    Messages:
    1,501
    Likes Received:
    0
    Joined:
    Nov 26, 2003
    Location:
    Anonymous

    I think you owe him a car!
     
  20. cws13

    cws13 Senior Member

    Messages:
    484
    Likes Received:
    0
    Joined:
    Nov 15, 2002
    Location:
    Athens,GA
    If you have a friend with a volt meter, chech the batt voltage with the car at idle. if it isn't in the high 13's. The voltage regulator is giving up the ghost. Also, while a load test is in order... You can test the static charge of the alt at idle with the same volt meter. if it is low you know your problem.. As a prelim, I often go for a real world load test- using the car. While checking amps, kick on the radio, brights, rear window defroster and A/C and see if you plummet. Those terminal ends are important too. Good luck.
     
Verification:
Draft saved Draft deleted

Share This Page