flashing battery light

SWEET2KSTANG · June 16th, 2009, 03:18 PM

i posted about this a couple years ago, but didnt get very far on it. i getting rid of my udp's and going back to my stockers. i got to remembering today about the issues it used to have with stock pulley's. i now have to worry about if the stupid thing is going to start doing it again.

at WOT about 4500 rpm's or so, the battery light would start flashing, it would did this at high rpm's. once i installed my udp's, the issue went away. the alt charges fine, belt is fine, etc. i still using the stock one that came on it, and dont have any plans to change it as of yet.

SWEET2KSTANG · June 17th, 2009, 02:49 AM

no one? honestly?

PapaSmurf · June 17th, 2009, 05:07 AM

it was the opposite for me. My underdrive pulleys caused the flashing battery light and like you said everything worked just fine. I eventually took the bulb out of the speedo cluster so i wouldnt have to see it anymore lol

SWEET2KSTANG · June 17th, 2009, 09:27 PM

come on guys.......

mpboy · June 17th, 2009, 09:49 PM

sweet, you know more about cars than i do, but my car did that same exact thing for about a month and my alternator was overchargeing and melted the wire leading from the alternator to the batt.

mpboy · June 17th, 2009, 09:50 PM

my alternator tested fine at the shop, but would only overcharge when i would goose it up to around 3500 and up

casper gt · June 17th, 2009, 09:55 PM

the high rpm over-charge makes the most sense, when you put the udp's on it slowed it (the alt) down enough not to notice the problem.

mpboy · June 17th, 2009, 11:14 PM

it fried my shit, and i didn't notice it until i smelled wires burning (thought it was stereo) and took me 2 hours to find the rubber boot that covers the contact on top of the alternator was melted... needless to say it fried all the way to the batt.

SWEET2KSTANG · June 17th, 2009, 11:37 PM

i checked the wiring and no damage. i not sure if its going to do the same thing again or not. i will be turning a lot more rpm's after the build, son i will have to keep an eye on it.

t70 · June 18th, 2009, 10:01 AM

could the light have been triggered by the belt slipping at the higher rpms maybe not charging well just briefly?

SWEET2KSTANG · June 18th, 2009, 12:35 PM

according to my tuner, i never had a drop in voltage. if i remember right, the lights would dim as well. its been so long i cant remember what all it was doing.

June 16th, 2009, 03:18 PM	#1
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	flashing battery light i posted about this a couple years ago, but didnt get very far on it. i getting rid of my udp's and going back to my stockers. i got to remembering today about the issues it used to have with stock pulley's. i now have to worry about if the stupid thing is going to start doing it again. at WOT about 4500 rpm's or so, the battery light would start flashing, it would did this at high rpm's. once i installed my udp's, the issue went away. the alt charges fine, belt is fine, etc. i still using the stock one that came on it, and dont have any plans to change it as of yet. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

June 17th, 2009, 02:49 AM	#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	no one? honestly? __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

June 17th, 2009, 05:07 AM	#3
PapaSmurf Hardcore Enthusiast 2003 Mustang GT 12.28 @ 116 Join Date: Jan 2008 Location: Chesapeake, VA Posts: 2,554 iTrader: 13 reviews	it was the opposite for me. My underdrive pulleys caused the flashing battery light and like you said everything worked just fine. I eventually took the bulb out of the speedo cluster so i wouldnt have to see it anymore lol __________________ 2003 Sonic Blue GT---SLP Longtubes, SLP X, Magnaflow Magnapack CB, 75mm TB/Plenum, MP2 Performance stage 2 heads, MHS Stage 3R cams, Built rear w/4.30's

June 17th, 2009, 09:27 PM	#4
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	come on guys....... __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

June 17th, 2009, 09:55 PM	#7
casper gt Moderator 2012 300a gt auto 12.10@116 Join Date: Mar 2008 Location: creighton pa Posts: 7,697 iTrader: 4 reviews	the high rpm over-charge makes the most sense, when you put the udp's on it slowed it (the alt) down enough not to notice the problem. __________________ MM BRACKET RACING CREW CO-FOUNDER BAMA Performance Drag Team Founder 2012 300a GT auto

June 17th, 2009, 11:37 PM	#9
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 checked the wiring and no damage. i not sure if its going to do the same thing again or not. i will be turning a lot more rpm's after the build, son i will have to keep an eye on it. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

June 18th, 2009, 10:01 AM	#10
t70 Regular 2000 GT CONVERTIBLE Join Date: Nov 2008 Location: ILLINOIS Posts: 208 iTrader: 0 reviews	could the light have been triggered by the belt slipping at the higher rpms maybe not charging well just briefly? __________________ silvermustangsregistry#0711

June 18th, 2009, 12:35 PM	#11
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	according to my tuner, i never had a drop in voltage. if i remember right, the lights would dim as well. its been so long i cant remember what all it was doing. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

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