Automatic windows & brakes causing diming lights

Zatrekaz · January 23rd, 2008, 03:23 AM

When I press up or down on my window's button my lights all around dim, and I can hear my engine lose some RPM's. This also happens when I touch my brakes. I can hear feedback in my subs when I hit the brakes as well.

I have replaced the battery with a Optima Yellow top that is about a year old. I have a 4guage ground from the battery to the chassi of the car... any ideas where I should start looking?

Mabey check all grounds... howerver I am fairly certin they are all good and tight. The sub's ground is tight as well... any ideas?

dansgt · January 23rd, 2008, 04:18 AM

your alternators not supplying enough power.

xROBxCOREx · January 23rd, 2008, 02:23 PM

^what he said. Sounds like your alternator is on its last legs.

04DSGV6 · January 23rd, 2008, 04:08 PM

Get alternator checked, if no problem then just add a battery capacitor to your car

Zatrekaz · January 23rd, 2008, 04:38 PM

ahh crap... alright I will run by the parts store and have them check it... I had a prob with the alternator not having a good connection awhile back.

I lost the nut that goes on the bolt that holds the connector. So I got one that fit tight and put it on there.... oh well taxes are coming soon, might have to get a new one.

Thanks for the replys

Zatrekaz · January 23rd, 2008, 09:58 PM

Well, Autozone tested my alt and it was pumping out 13.8v at idle....

There was only about .5v drain when I hit the window motors. Im going to check the fuse to the motors tomorrow and check all my grounds in the engine compartment. Any other ideas I can try?

Zatrekaz · January 24th, 2008, 12:06 PM

any ideas?

Breakout · January 24th, 2008, 12:08 PM

do you have a capacitor for your subs and amp? If you're running a decent sound system...this is a must have. This will keep your lights from flickering by providing constant voltage to your subs and amp. It will also save your alternator.

Zatrekaz · January 26th, 2008, 05:56 AM

Eh, I dont like Caps... used them and they dont do that great. All they really do is use power from you car to charge another small battery in the cap. Which gets drained by using the subs, and just has to be recharged. Its basicly adding a small battery. The best way I found to elminate the dimming from subs:

Big 3 upgrade
4 guage from Alt to Battery, with atleast 100amp inline fuse
extra 4 guage ground from bat to chass
4 guage ground from alt to chass

This got rid of my dimming and drainging problems from my subs. The question is how my windows are casing this... I do NOT want this to run into a Capacitor debate. I apperciate you tryin to help, just dont like usin caps personally.

04DSGV6 · January 27th, 2008, 03:27 PM

turn your subs and radio off. If you then hit your brakes or windows do they dim?

Zatrekaz · January 29th, 2008, 06:41 PM

at work, but will check when I get off...

Hourofpain · February 1st, 2008, 07:02 AM

Haha
thats so funny

last month or so i poted a vid where my car did the same thing

and your running a sub and amp?

Evil Klown · February 1st, 2008, 01:35 PM

What you need to do is check the amps that the motor uses to pull the window down and up and from there do the math to check if anything is outta wack, a .5V drop for your windows is normal and by the way my car does the same thing. You have to consider that with your lights on it pulls more amps from your battery and with you using the windows at the same time you will see the voltage drop in the dash.

mxnate116 · February 1st, 2008, 04:00 PM

yeah i would go through and check all your grounds and connections.
it wouldnt hurt to grind down the paint on all the grounds.

good call on the big three upgrade btw.

January 23rd, 2008, 03:23 AM	#1
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,622 iTrader: 12 reviews	Automatic windows & brakes causing diming lights When I press up or down on my window's button my lights all around dim, and I can hear my engine lose some RPM's. This also happens when I touch my brakes. I can hear feedback in my subs when I hit the brakes as well. I have replaced the battery with a Optima Yellow top that is about a year old. I have a 4guage ground from the battery to the chassi of the car... any ideas where I should start looking? Mabey check all grounds... howerver I am fairly certin they are all good and tight. The sub's ground is tight as well... any ideas? __________________ OEM Used 99-04 Dark Charcoal Carpet For Sale

January 23rd, 2008, 04:18 AM	#2
dansgt Hardcore Enthusiast 03 Mustang GT 91 bmw 525i Join Date: Nov 2007 Location: Anaheim, CA Posts: 1,292 iTrader: 2 reviews	your alternators not supplying enough power. __________________

January 23rd, 2008, 04:38 PM	#5
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,622 iTrader: 12 reviews	ahh crap... alright I will run by the parts store and have them check it... I had a prob with the alternator not having a good connection awhile back. I lost the nut that goes on the bolt that holds the connector. So I got one that fit tight and put it on there.... oh well taxes are coming soon, might have to get a new one. Thanks for the replys __________________ OEM Used 99-04 Dark Charcoal Carpet For Sale

January 23rd, 2008, 09:58 PM	#6
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,622 iTrader: 12 reviews	Well, Autozone tested my alt and it was pumping out 13.8v at idle.... There was only about .5v drain when I hit the window motors. Im going to check the fuse to the motors tomorrow and check all my grounds in the engine compartment. Any other ideas I can try? __________________ OEM Used 99-04 Dark Charcoal Carpet For Sale

January 24th, 2008, 12:06 PM	#7
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,622 iTrader: 12 reviews	any ideas? __________________ OEM Used 99-04 Dark Charcoal Carpet For Sale

January 23rd, 2008, 02:23 PM	#3
xROBxCOREx Newbie Join Date: Jan 2008 Posts: 14 iTrader: 0 reviews	^what he said. Sounds like your alternator is on its last legs.

January 23rd, 2008, 04:08 PM	#4
04DSGV6 Enthusiast 2004 Mustang V6 Join Date: Oct 2007 Location: Chicago,IL Posts: 546 iTrader: 1 reviews	Get alternator checked, if no problem then just add a battery capacitor to your car

January 24th, 2008, 12:08 PM	#8
Breakout Tree Fiddy Z 2006 Nissan 350Z Join Date: Dec 2006 Location: Central Florida Posts: 2,031 iTrader: 0 reviews	do you have a capacitor for your subs and amp? If you're running a decent sound system...this is a must have. This will keep your lights from flickering by providing constant voltage to your subs and amp. It will also save your alternator.

January 26th, 2008, 05:56 AM	#9
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,622 iTrader: 12 reviews	Eh, I dont like Caps... used them and they dont do that great. All they really do is use power from you car to charge another small battery in the cap. Which gets drained by using the subs, and just has to be recharged. Its basicly adding a small battery. The best way I found to elminate the dimming from subs: Big 3 upgrade 4 guage from Alt to Battery, with atleast 100amp inline fuse extra 4 guage ground from bat to chass 4 guage ground from alt to chass This got rid of my dimming and drainging problems from my subs. The question is how my windows are casing this... I do NOT want this to run into a Capacitor debate. I apperciate you tryin to help, just dont like usin caps personally. __________________ OEM Used 99-04 Dark Charcoal Carpet For Sale

January 27th, 2008, 03:27 PM	#10
04DSGV6 Enthusiast 2004 Mustang V6 Join Date: Oct 2007 Location: Chicago,IL Posts: 546 iTrader: 1 reviews	turn your subs and radio off. If you then hit your brakes or windows do they dim?

January 29th, 2008, 06:41 PM	#11
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,622 iTrader: 12 reviews	at work, but will check when I get off... __________________ OEM Used 99-04 Dark Charcoal Carpet For Sale

February 1st, 2008, 07:02 AM	#12
Hourofpain Hardcore Enthusiast 2005 Torrid Red GTO m6 Join Date: Mar 2007 Location: Virginia Beach Posts: 1,526 iTrader: 0 reviews	Haha thats so funny last month or so i poted a vid where my car did the same thing and your running a sub and amp? __________________ 1996 Cobra To be sold... 2005 M6 Twin Turbo GTO Torrid Red Fully Forged LS2 Block Built to handle 1000RWHP. Fully ported Dart Heads. Edelbrock Jr Intake. Custom cut upper intake plenum. APS twin Turbo System with APS twin Fuel pumps.

February 1st, 2008, 01:35 PM	#13
Evil Klown Regular 2002 Mustang GT Join Date: Dec 2007 Location: Idaho Posts: 134 iTrader: 0 reviews	What you need to do is check the amps that the motor uses to pull the window down and up and from there do the math to check if anything is outta wack, a .5V drop for your windows is normal and by the way my car does the same thing. You have to consider that with your lights on it pulls more amps from your battery and with you using the windows at the same time you will see the voltage drop in the dash.

February 1st, 2008, 04:00 PM	#14
mxnate116 Hardcore Enthusiast 88 mustang GT Join Date: Jun 2007 Location: Spokane, WA Posts: 2,883 iTrader: 1 reviews	yeah i would go through and check all your grounds and connections. it wouldnt hurt to grind down the paint on all the grounds. good call on the big three upgrade btw.

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