Battery light???

Nostang · December 8th, 2009, 05:57 PM

My battery light flickers or sumtimes even stays on under "heavy acceleration" batt stays charged, starts fine, replaced terminals, could it slightly be over charging? Would a high voltage make the light come on?? Thanks

SWEET2KSTANG · December 8th, 2009, 10:41 PM

i had same issue, not sure what it is. mine went away after i put my udp's on. now that i am going back to the stock set up, i am wondering if it will do the same thing.

Boostang · December 8th, 2009, 10:43 PM

Nostang · December 9th, 2009, 02:18 AM

Originally Posted by SWEET2KSTANG

i had same issue, not sure what it is. mine went away after i put my udp's on. now that i am going back to the stock set up, i am wondering if it will do the same thing.

Let me know if it does... It's not realy bothering me to much jus was making sure wasn't gona blow up my battery or any thing!!

01KnightRiderGT · December 9th, 2009, 11:17 AM

i had the same issue but after i changed my altenator it went away, i guess its letting you know your altenator is going.

03_StangGuy · December 9th, 2009, 11:19 AM

The battery light comes one when your not holding/charging the battery fully. Whens the last time you changed your belt? Id at least remove it and clean it, dirt and stuff can cause it to slip. If that doesnt help and your belt is in good shape it may be your altenator.

ZenMGT · December 9th, 2009, 11:23 AM

^^^+1 - haven't experienced on the stang yet,,but on all my other cars, when the batt. light came on it was a charging issue,,usually too low,,and usually the alternator was the culprit. Or an external voltage regulator if we have one on these cars.

Nostang · December 9th, 2009, 04:02 PM

I have an underdrive kit and I think it's making my tensener go out it wobbles alot! When i hit 3rd I hear a a slight belt squek, the belt is brand new tho???

SWEET2KSTANG · December 10th, 2009, 02:15 PM

Originally Posted by Nostang

Let me know if it does... It's not realy bothering me to much jus was making sure wasn't gona blow up my battery or any thing!!

not sure. my car was doing it on the stock pulley's when i was at 5k+ rpms and went away when i shifted to next gear.

Originally Posted by 01KnightRiderGT

i had the same issue but after i changed my altenator it went away, i guess its letting you know your altenator is going.

i still on the the same alt. it is the factory alt as well.

ForestGRN_Ghost · December 10th, 2009, 04:29 PM

Originally Posted by Nostang

My battery light flickers or sometimes even stays on under "heavy acceleration" batt stays charged, starts fine, replaced terminals, could it slightly be over charging? Would a high voltage make the light come on?? Thanks

mine dose the same thing. been doing it since i had the car ...3 years ago.
alt hasnt quit. my radar detector has a battery voltage monitor. and it says my battery is fine. i dont think its the alt. because like i said its been fine for the last 3 years.
it only blinks under hard acceleration.

slikirish · December 10th, 2009, 04:43 PM

It could easily be a belt slipping slightly, dropping charge in the battery for a moment and causing the light to flicker.

Do your headlights or interior lights dim at an idle?

03_StangGuy · December 10th, 2009, 05:01 PM

Originally Posted by 03_StangGuy

The battery light comes one when your not holding/charging the battery fully. Whens the last time you changed your belt? Id at least remove it and clean it, dirt and stuff can cause it to slip. If that doesnt help and your belt is in good shape it may be your altenator.

Originally Posted by slikirish

It could easily be a belt slipping slightly, dropping charge in the battery for a moment and causing the light to flicker.

Do your headlights or interior lights dim at an idle?

Like i said clean the belt if its in good shape before you start spending money.

C MY 4D · December 10th, 2009, 05:06 PM

I would check the diode ripple. More than likely a diode is starting to fail.

RyanGT · December 11th, 2009, 01:48 AM

When my alt crapped out last month it did same thing. But it didn't blink it stayed on.

So i would go with what the other people said, check for belt slippage. Or a loose pulley, and bad tensioner should be replaced even if not the problem. I had one rip out of timing cover before... that was not fun.

Nostang · December 11th, 2009, 04:09 AM

I was messing around with my buddy in his gto last night and noticed when I hit it around 4500-5000 to red line it would flicker and my head lifts would dim.. So tommarow I'm gona change that tensioner and see what that does!

95BlackStang · December 14th, 2009, 07:08 PM

this is really weird mine does the complete opposite of wat you guys are saying, it usually comes on after i drive it for about 15 mins then everything goes dim and the needle drops to like 1/4 but when i accelerate to about 4-5k it turns off and everything gets normal

slikirish · December 14th, 2009, 07:28 PM

that sounds like the alternator is going out. Not charging except when in the upper RPMs.

December 8th, 2009, 05:57 PM	#1
Nostang Regular 2000 mustang GT Join Date: Nov 2009 Location: cleburne tx. Posts: 101 iTrader: 0 reviews	Battery light??? My battery light flickers or sumtimes even stays on under "heavy acceleration" batt stays charged, starts fine, replaced terminals, could it slightly be over charging? Would a high voltage make the light come on?? Thanks __________________ 2000 GT comp cams, bbk cold air intake, bbk headers, bbk h-pipe, steeda underdrive pullys, NX 150 shot, All blacked out!!!

December 8th, 2009, 10:41 PM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	i had same issue, not sure what it is. mine went away after i put my udp's on. now that i am going back to the stock set up, i am wondering if it will do the same thing. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

December 8th, 2009, 10:43 PM	#3
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,747 iTrader: 0 reviews	__________________ If It Dont Flow It Wont Go!!! forged pistons,teksid block and a romeo cast cranks for sale.. pm if interested.. selling them for next too nothing

December 9th, 2009, 11:17 AM	#5
01KnightRiderGT Hardcore Enthusiast 2001 Mustang GT Join Date: Feb 2009 Location: Miami,FL Posts: 1,817 iTrader: 0 reviews	i had the same issue but after i changed my altenator it went away, i guess its letting you know your altenator is going. __________________ Black Stang Member #13 315's Crew Founder My Track Videos

December 9th, 2009, 11:19 AM	#6
03_StangGuy I Poop Entirely Way Too Much Blown 03 GT Join Date: Jun 2007 Location: Long Island NY Posts: 6,917 iTrader: 0 reviews	The battery light comes one when your not holding/charging the battery fully. Whens the last time you changed your belt? Id at least remove it and clean it, dirt and stuff can cause it to slip. If that doesnt help and your belt is in good shape it may be your altenator. __________________

December 9th, 2009, 11:23 AM	#7
ZenMGT Hardcore Enthusiast '02 GT 5spd Join Date: Oct 2009 Location: Boca Posts: 1,133 iTrader: 1 reviews	^^^+1 - haven't experienced on the stang yet,,but on all my other cars, when the batt. light came on it was a charging issue,,usually too low,,and usually the alternator was the culprit. Or an external voltage regulator if we have one on these cars. __________________ boringly stock........but running well

December 9th, 2009, 04:02 PM	#8
Nostang Regular 2000 mustang GT Join Date: Nov 2009 Location: cleburne tx. Posts: 101 iTrader: 0 reviews	I have an underdrive kit and I think it's making my tensener go out it wobbles alot! When i hit 3rd I hear a a slight belt squek, the belt is brand new tho??? __________________ 2000 GT comp cams, bbk cold air intake, bbk headers, bbk h-pipe, steeda underdrive pullys, NX 150 shot, All blacked out!!!

December 10th, 2009, 04:43 PM	#11
slikirish Hardcore Enthusiast 2004 Mustang GT 5spd Join Date: Nov 2009 Location: Wooster, OH Posts: 2,679 iTrader: 0 reviews	It could easily be a belt slipping slightly, dropping charge in the battery for a moment and causing the light to flicker. Do your headlights or interior lights dim at an idle?

December 10th, 2009, 05:06 PM	#13
C MY 4D Billy Weston 2003 Cobra 11.14@124.36 Join Date: Aug 2006 Location: Hampton, VA Posts: 4,806 iTrader: 8 reviews	I would check the diode ripple. More than likely a diode is starting to fail. __________________ TT Build in progress....... Need work done to your car for a great price in Hampton Roads? Shoot me a PM.

December 11th, 2009, 01:48 AM	#14
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	When my alt crapped out last month it did same thing. But it didn't blink it stayed on. So i would go with what the other people said, check for belt slippage. Or a loose pulley, and bad tensioner should be replaced even if not the problem. I had one rip out of timing cover before... that was not fun. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

December 11th, 2009, 04:09 AM	#15
Nostang Regular 2000 mustang GT Join Date: Nov 2009 Location: cleburne tx. Posts: 101 iTrader: 0 reviews	I was messing around with my buddy in his gto last night and noticed when I hit it around 4500-5000 to red line it would flicker and my head lifts would dim.. So tommarow I'm gona change that tensioner and see what that does! __________________ 2000 GT comp cams, bbk cold air intake, bbk headers, bbk h-pipe, steeda underdrive pullys, NX 150 shot, All blacked out!!!

December 14th, 2009, 07:28 PM	#17
slikirish Hardcore Enthusiast 2004 Mustang GT 5spd Join Date: Nov 2009 Location: Wooster, OH Posts: 2,679 iTrader: 0 reviews	that sounds like the alternator is going out. Not charging except when in the upper RPMs.

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: Battery light???
Thread	Thread Starter	Forum	Replies	Last Post
Battery light	Megawatts88	V6 Mustangs	23	September 4th, 2010 03:34 PM
Battery light on?	03_StangGuy	99-04	5	June 15th, 2009 03:27 PM
battery light?	ZoomZoomMFer	99-04	6	April 16th, 2009 12:02 AM
Battery light	DblAughtGT	99-04	0	April 13th, 2009 11:05 AM
Battery light?	93HatchsBFF	5.0 Mustangs	6	November 29th, 2008 02:43 AM

All times are GMT -4. The time now is 01:25 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.