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Why do my lights dim?

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Old 11-19-2007, 12:13 PM
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Default Why do my lights dim?

i searched the site and found nothin to help me. I got a 99LS 5spd. Every time i use a power accesory on my car w/ the light on, they all dim badly. Like if i have my headlights on and use my window, my dome lights and headlight dim until i let go of the window switch. What the problem here? or is it normal? its kinda annoying. Any help appreciated, thanx guys
Old 11-19-2007, 12:33 PM
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Default Re: Why do my lights dim? (gofastgokart99)

Its normal. its because you are drawing more amperage from the alternator. it is most noticeable when the car is idling.
Old 11-19-2007, 12:38 PM
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Default Re: Why do my lights dim? (acuradriva)

ok sweet, thought i might have had bad wiring or sompthin. thanx man
Old 11-19-2007, 12:51 PM
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mine does it too..more noticeable when idling..
Old 11-19-2007, 02:03 PM
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Default Re: Why do my lights dim? (gofastgokart99)

yea dude dont sweat it.. mine dont do it that much, only when my box is at its finest..
Old 11-19-2007, 02:30 PM
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i had something similiar except it was only when the brakes were pressed it dimmed
Old 11-19-2007, 05:52 PM
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Default Re: (l Nova l)

My lights dim and my idle goes down when I steer while in neutral...
Old 11-20-2007, 12:56 PM
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Default Re: (l Nova l)

yeah i did a lot of reading yesterday and pretty much any power accesoy like power streering, windows, lock, moon roof, and especially A/C cause it runs off the motor draws extra power making everything dim. i got a yellow top so i guees it cant be helped
Old 11-20-2007, 01:03 PM
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umm, no people this is NOT normal behavior. I have a regular Sears battery and my car does not act this way at all. I can have my stereo on, bass hitting, rolling windows up and down and moving the sunroof, and HID headlights on while sitting idling, and I do not notice anything dimming or otherwise out of the ordinary.

Things dimming like that usually indicate a problem with the alternator.
Old 11-20-2007, 01:08 PM
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Default Re: (PatrickGSR94)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PatrickGSR94 &raquo;</TD></TR><TR><TD CLASS="quote">umm, no people this is NOT normal behavior. I have a regular Sears battery and my car does not act this way at all. I can have my stereo on, bass hitting, rolling windows up and down and moving the sunroof, and HID headlights on while sitting idling, and I do not notice anything dimming or otherwise out of the ordinary.

Things dimming like that usually indicate a problem with the alternator.</TD></TR></TABLE>


I agree with him
Old 11-20-2007, 01:15 PM
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Default Re: (PatrickGSR94)

i agree with that guy too

my integra doesn't dim at all when i use accessories. i have the small honda battery.
Old 11-20-2007, 01:48 PM
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Default Re: (ZE12O)

the battery has nothing to do with it. when the car is running the car is powered by the alternator. Unless the voltage drops down to around 12.5 volts but by then the lights will defiantly be dimmer. for those that don't have the dimming with the lights on at idle and closing the windows, do the headlights dim when you shut the car off? you may have alternator problems.
Old 11-21-2007, 11:58 AM
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Default Re: (acuradriva)

now that you guys bring this topic up. My power acc. dims too! When i shut the car off, my headlights dont dim, they stay bright as hell, then again i have HIDs, does that matter?

Now i want to fix my power loss!!!!!!!!!!! DAMIT! so is it the alternator or something else?
Old 11-21-2007, 11:59 AM
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i have a 99 dc2 by the way
Old 11-21-2007, 12:03 PM
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Default Re: (acuradriva)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by acuradriva &raquo;</TD></TR><TR><TD CLASS="quote">do the headlights dim when you shut the car off? you may have alternator problems.</TD></TR></TABLE>

Your head lights will dim a little when you turn off your car b/c it is going from 13+ from the alt to 12.5+ of the battery.

You will want to check the output of your alt while it is running to see if there is a problem. Should be over 13, and no more than 14.5.

Also, your alt makes the most power at 2k RMPS. No need to rev the **** out of your car
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