lighs dim when i use certain buttons?? ideas??

stangman92 · December 18th, 2009, 07:56 PM

Ok, when i for example use the window motors or anything electrical that has i high current draw, my lights dim, the strange thing is that i doubt its my alternator because my car starts fine all the time every time, so if it was my alternator it wouldnt be charging so i would have some starting problems correct? Maybe a ground or something.
I have no problems with it but i would like to fix it.

Any ideas??

BadBlackGT · December 18th, 2009, 07:57 PM

Originally Posted by stangman92

Ok, when i for example use the window motors or anything electrical that has i high current draw, my lights dim, the strange thing is that i doubt its my alternator because my car starts fine all the time every time, so if it was my alternator it wouldnt be charging so i would have some starting problems correct? Maybe a ground or something.
I have no problems with it but i would like to fix it.

Any ideas??

Mine does the same thing... like after they're rolled all the way up and you hold it down for a split second more.

dpbbnc89 · December 18th, 2009, 07:58 PM

happens on both me and my buddies' too. I think it's just a thing with mustangs.

BadBlackGT · December 18th, 2009, 08:01 PM

Originally Posted by dpbbnc89

happens on both me and my buddies' too. I think it's just a thing with mustangs.

Yeah i think so too. Do you have UDP's?

stangman92 · December 18th, 2009, 08:03 PM

no UDP's i know i should check the voltage with a multimeter but im lazy jaja, And i have yet to do an alternator load test, but again, if it were the alternator, the lights wouldnt dim when i rev the engine, to produce more output, But it still does. yea exactly after the windows go up and you hold it a little longer

dpbbnc89 · December 18th, 2009, 08:11 PM

Originally Posted by BadBlackGT

Yeah i think so too. Do you have UDP's?

nope, stock pulleys

mrbigjeep · December 19th, 2009, 01:21 AM

mine does it too. good brand new batt. and good alt. i think it may just be a mustang thing

Safi · December 19th, 2009, 02:17 AM

It's just drawing too much power. The window motor needs more power to get the windows up so it pulls away some of the power in the lights (simple way to explain it...I could do a more detailed, but would take a long time lol)

v606er · December 19th, 2009, 02:35 AM

Well I have UDP's and I lowered my idle rpm's with my xcal3, and my head lights dim, and the AC air flow goes down(when on full blast) when I'm stopped.

wraitherx · December 19th, 2009, 02:43 AM

Originally Posted by Safi

It's just drawing too much power. The window motor needs more power to get the windows up so it pulls away some of the power in the lights (simple way to explain it...I could do a more detailed, but would take a long time lol)

DING DING DING... give this man a cookie

BadBlackGT · December 19th, 2009, 02:53 PM

Originally Posted by v606er

Well I have UDP's and I lowered my idle rpm's with my xcal3, and my head lights dim, and the AC air flow goes down(when on full blast) when I'm stopped.

Yeah, thats a UDP thing... i noticed that with my heater when i'm stopped it stops blowing as hard until i start driving again.

JoshC! · December 19th, 2009, 03:30 PM

udp's shouldnt affect anything electrical. udp sets come with a bigger alt. pulley so it still charges correctly. your lights dimming is a mustang thing. every stang ive driven does this.

mrsinister2424 · December 19th, 2009, 03:40 PM

There's a lot of cars that do this... Its completely normal.

C MY 4D · December 19th, 2009, 03:41 PM

I would still do a load test to the alternator and see how many amps it can put out.
Using other accessories really shouldn't be that noticable.

Redux · December 19th, 2009, 04:17 PM

Could also be a ground problem.

C MY 4D · December 19th, 2009, 05:11 PM

Originally Posted by Redux

Could also be a ground problem.

or a voltage drop issue to the battery.... I'd still start by load testing the alt...

Bobert · December 19th, 2009, 06:47 PM

That is why I run a kinetik hc600 in the trunk as an alternate. It helps but I still get a slight dim when it gets real cold. It's connected to my primary battery via 4guage stinger power and ground. I've noticed it in every mustang I've been in to. Just a poor stock electrical design.

TheUNZippee! · December 19th, 2009, 06:48 PM

Originally Posted by C MY 4D

or a voltage drop issue to the battery.... I'd still start by load testing the alt...

This^

December 18th, 2009, 07:56 PM	#1
stangman92 Regular 2002 mustang GT Join Date: Jun 2009 Location: Ft lauderdale, fl Posts: 334 iTrader: 0 reviews	lighs dim when i use certain buttons?? ideas?? Ok, when i for example use the window motors or anything electrical that has i high current draw, my lights dim, the strange thing is that i doubt its my alternator because my car starts fine all the time every time, so if it was my alternator it wouldnt be charging so i would have some starting problems correct? Maybe a ground or something. I have no problems with it but i would like to fix it. Any ideas??

December 19th, 2009, 01:21 AM	#7
mrbigjeep I Post Entirely Way Too Much 04 mustang gt 7.21 @ 98 Join Date: Apr 2008 Location: upstate sc Posts: 5,683 iTrader: 0 reviews	mine does it too. good brand new batt. and good alt. i think it may just be a mustang thing __________________ cams + 150 shot

December 19th, 2009, 03:30 PM	#12
JoshC! ! Post Entirely Way Too Much 2000 GT Vert 14.646 @ 97.41 2.37 60' Need to hit the track with my new mods Join Date: Oct 2007 Location: Odessa, Texas Posts: 5,343 iTrader: 0 reviews	udp's shouldnt affect anything electrical. udp sets come with a bigger alt. pulley so it still charges correctly. your lights dimming is a mustang thing. every stang ive driven does this. __________________ Im topless, are you? Topless Mustang Club Founder Black Stang Crew Member #boobs out mods/pics BAMA Performance Drag Team #3

December 19th, 2009, 03:40 PM	#13
mrsinister2424 Hardcore Enthusiast 99' Mustang GT 3214@OVER 9000!!! Join Date: Dec 2008 Location: Redlands, CA Posts: 2,626 iTrader: 0 reviews	There's a lot of cars that do this... Its completely normal. __________________ 99' Rio Red Mustang GT: --My Garage-- Check garage. Vortech V-1 intercooled running 9lbs of boost Life= eat, lift, eat, eat, eat, sleep, repeat

December 19th, 2009, 03:41 PM	#14
C MY 4D Billy Weston 2003 Cobra 11.14@124.36 Join Date: Aug 2006 Location: Hampton, VA Posts: 4,794 iTrader: 7 reviews	I would still do a load test to the alternator and see how many amps it can put out. Using other accessories really shouldn't be that noticable. __________________ TT Build in progress....... Need work done to your car for a great price in Hampton Roads? Shoot me a PM.

December 18th, 2009, 07:58 PM	#3
dpbbnc89 Regular 2003 Mustang GT Join Date: May 2009 Location: Concord, NC Posts: 57 iTrader: 3 reviews	happens on both me and my buddies' too. I think it's just a thing with mustangs.

December 18th, 2009, 08:03 PM	#5
stangman92 Regular 2002 mustang GT Join Date: Jun 2009 Location: Ft lauderdale, fl Posts: 334 iTrader: 0 reviews	no UDP's i know i should check the voltage with a multimeter but im lazy jaja, And i have yet to do an alternator load test, but again, if it were the alternator, the lights wouldnt dim when i rev the engine, to produce more output, But it still does. yea exactly after the windows go up and you hold it a little longer

December 19th, 2009, 06:47 PM	#17
Bobert Newbie 1999 Mustang GT stock Join Date: Jan 2009 Location: Granite City, Illinois Posts: 22 iTrader: 0 reviews	That is why I run a kinetik hc600 in the trunk as an alternate. It helps but I still get a slight dim when it gets real cold. It's connected to my primary battery via 4guage stinger power and ground. I've noticed it in every mustang I've been in to. Just a poor stock electrical design.

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