Battery light coming on @ 8800+ rpms

9400RPMS · Post by **9400RPMS** » Tue Jun 28, 2011 9:25 pm

Did a pull today to just check some stuff on a datalog. Redline is set @ 9400rpms CEL shift light @ 8900rpms This is the first time of me ever seeing this.. About 8500rpms rolls around and from 8500-9400rpms, the battery light comes on. On the datalog battery voltage is constant 13.8-13.5 volts New alternator, if i had to guess probably 2 weeks old? I've been having issues with the nut staying tight, so i got a new alternator as i've had a few wires fry because it's been coming undone. I'm wondering if anyone else has experienced this issue..?? If i had to guess, maybe the belt is slipping? Its pretty tight , i dont see how. All my grounds are in check and voltage is within spec.

JaredKaragen · Post by **JaredKaragen** » Tue Jun 28, 2011 10:52 pm

Maybe the brushes are chattering at high speed... I've encountered plenty of bad 'good new' parts... Even 12thou warped NEW rotors.

TopMountGSR · Post by **TopMountGSR** » Wed Jun 29, 2011 3:27 am

Could the belt be slipping? Sounds odd but I have seen it happen with most high rpm hondas. They chew the alternator belts up till you either go with a ati crank pulley, a light weight alt pulley or both. Maybe a shot in the dark, but just tryin to help.

utkuselamoglu · Post by **utkuselamoglu** » Wed Jun 29, 2011 3:33 am

you can try changing the pulley with a bigger one.

9400RPMS · Post by **9400RPMS** » Wed Jun 29, 2011 8:27 am

I think i'ma buy a new belt friday just for shits.. Seems like it didn't do it this morning on the way to work. I hooked up my labtop and datalog a few pulls. For whatever reason, i had disable ELD, alternator control. I re-enabled those, as i normally never turn those off, its seem to go away, but i'ma change the belt anyway. Any idea what alternator control does?? i know what ELD does.. but i've never paided attention to the alternator control, i've just always left it on.

utkuselamoglu · Post by **utkuselamoglu** » Wed Jun 29, 2011 8:34 am

alternator control works at the idle it does not change anything while revving.

JaredKaragen · Post by **JaredKaragen** » Wed Jun 29, 2011 9:13 pm

utkuselamoglu wrote:you can try changing the pulley with a bigger one.

the AEM pulleys are awesome... aside from the fact that the alternator pulley only fits the Mitsubishi Alternator (bigger shaft) and those ones are unicorns nowadays... I have specifically tried seeking a new one out and haven't found one yet.

9400RPMS · Post by **9400RPMS** » Thu Jun 30, 2011 10:35 am

problem still there. tighten the belt and checked wiring.. still there. i'll try a new belt tomorrow..

Almighty-Si · Post by **Almighty-Si** » Thu Jun 30, 2011 3:44 pm

Roughly how old is the battery?

9400RPMS · Post by **9400RPMS** » Thu Jun 30, 2011 9:29 pm

Almighty-Si wrote:Roughly how old is the battery?

year or so, never had a problem with it. Came on again this morning, after being fully warmed.. voltage doesn't drop below 13.8 All the way through the power band.. dunno whats up.. rather annoying.