battery light come on?

thomasdale2144 · May 15th, 2011, 11:12 PM

Whenever i floor it and get the RPMs up to like 5K-7K my battery light comes on... is this normal?

mustangmike! · May 15th, 2011, 11:21 PM

i hope your not getting to 7k rpm ! id have more than a battery light on too !

thomasdale2144 · May 15th, 2011, 11:26 PM

lol ok like 6.4k but it only comes on between like 5K and Redline, but once its below that it goes away

mp4 player · May 15th, 2011, 11:26 PM

It's not normal. I had the exact same problem and it turned out the alternator wasn't regulating the voltage correctly at high RPM. Replaced the alternator and it's been fine ever since.

To be more specific it was dropping from around 13V of output to 8V. I datalogged it with my tuner and it would do that every time at high rpm

thomasdale2144 · May 15th, 2011, 11:30 PM

So new alternator?? or would it be fine if i only only get it up there like 4 times a month at the strip

mp4 player · May 15th, 2011, 11:35 PM

Originally Posted by thomasdale2144

So new alternator?? or would it be fine if i only only get it up there like 4 times a month at the strip

I'd just replace it. Mine started to slowly get lower and lower until it was doing it at around 3500rpm. Plus my car runs so much better at high RPMs with the new one because of that.

thomasdale2144 · May 16th, 2011, 07:15 AM

alright i will go try to find one thanks

May 15th, 2011, 11:12 PM	#1
thomasdale2144 Enthusiast 96 GT with 97 cobra swap 13.65@101.3 Join Date: Sep 2010 Location: Plymouth, MN Posts: 684 iTrader: 0 reviews	battery light come on? Whenever i floor it and get the RPMs up to like 5K-7K my battery light comes on... is this normal? __________________ 1999 V6 CAI, Tune (Sold) 1996 GT Vert 97 Cobra Engine Swap, Mods in Garage 248.8 RWHP, 353.3RWTQ But having a 4V makes it a Cobra Want to join the FOBRA club? MM FOBRA CLUB FOUNDER

May 15th, 2011, 11:21 PM	#2
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	i hope your not getting to 7k rpm ! id have more than a battery light on too ! __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

May 15th, 2011, 11:26 PM	#3
thomasdale2144 Enthusiast 96 GT with 97 cobra swap 13.65@101.3 Join Date: Sep 2010 Location: Plymouth, MN Posts: 684 iTrader: 0 reviews	lol ok like 6.4k but it only comes on between like 5K and Redline, but once its below that it goes away __________________ 1999 V6 CAI, Tune (Sold) 1996 GT Vert 97 Cobra Engine Swap, Mods in Garage 248.8 RWHP, 353.3RWTQ But having a 4V makes it a Cobra Want to join the FOBRA club? MM FOBRA CLUB FOUNDER

May 15th, 2011, 11:26 PM	#4
mp4 player Hardcore Enthusiast '00 V6 Procharged Mustang Join Date: Feb 2008 Location: WA Posts: 1,345 iTrader: 1 reviews	It's not normal. I had the exact same problem and it turned out the alternator wasn't regulating the voltage correctly at high RPM. Replaced the alternator and it's been fine ever since. To be more specific it was dropping from around 13V of output to 8V. I datalogged it with my tuner and it would do that every time at high rpm __________________ 2000 Prochaged V6. T-lok, Mach 1 takeoff exhaust with H-pipe, 20% tint, OEM fogs and all HIDs. SAE Corrected: 289HP/298TQ at 5100RPM(Pegged MAF).

May 15th, 2011, 11:30 PM	#5
thomasdale2144 Enthusiast 96 GT with 97 cobra swap 13.65@101.3 Join Date: Sep 2010 Location: Plymouth, MN Posts: 684 iTrader: 0 reviews	So new alternator?? or would it be fine if i only only get it up there like 4 times a month at the strip __________________ 1999 V6 CAI, Tune (Sold) 1996 GT Vert 97 Cobra Engine Swap, Mods in Garage 248.8 RWHP, 353.3RWTQ But having a 4V makes it a Cobra Want to join the FOBRA club? MM FOBRA CLUB FOUNDER

May 16th, 2011, 07:15 AM	#7
thomasdale2144 Enthusiast 96 GT with 97 cobra swap 13.65@101.3 Join Date: Sep 2010 Location: Plymouth, MN Posts: 684 iTrader: 0 reviews	alright i will go try to find one thanks __________________ 1999 V6 CAI, Tune (Sold) 1996 GT Vert 97 Cobra Engine Swap, Mods in Garage 248.8 RWHP, 353.3RWTQ But having a 4V makes it a Cobra Want to join the FOBRA club? MM FOBRA CLUB FOUNDER

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