alternator

moe0001 · Tue, Apr-20-2010, 03:22:56 AM

so my battery light comes on car dies, so i get the car towed to my house i change the alternator and battery the light still comes on, could the alternator not be the rite one it fit perfectly in all ways

any ideas?

**deilenberger** · Tue, Apr-20-2010, 06:33:42 PM

Where did you get the replacement from? If it's not rebuilt by Bosch - it's likely crap.

Or you could have screwed up the installation.

BTW - adding "!!!!!!!!!!" to your thread title does two things (1) pisses me off (2) makes you look like a child. #2 is probably why you've received no responses to your posting.

Raster22 · Tue, Apr-20-2010, 06:54:55 PM

I would suspect the voltage regulator in the alternator. Is it a name brand replacement?

Gregs///M · Tue, Apr-20-2010, 08:26:35 PM

Make sure your battery connections are clean and grip the posts very hard.

**deilenberger** · Tue, Apr-20-2010, 11:22:25 PM

Won't do a thing. The red alternator light is turned on when there is a difference between the alternator output and the system voltage. If it comes on (read the sticky..) the alternator is not making current. It's dead, kaput, passed on, nailed to the perch. So far - in about 100 of the times this has come up - 100 of them have been the alternator is bad. Odds are awfully good the "rebuild" came from a chain auto parts store - where a rebuild generally consists of getting them from a junkyard and painting them so they look pretty. That seems to be the rather common scenerio. Only other possibility is the wires are hooked up wrong, but that's doubtful since they only can be connected one way (unless you are VERY VERY forceful.)

moe0001 · Thu, Apr-22-2010, 05:48:01 AM

It turns out it was faulty, it was my first time going to this parts store everywhere else needed 3 to 4 days, I bought one out of a parted out m3 in the city. Every things working great now. Sorry for the !!!!! that is just how i felt, the light came and died while i was on a highway in busy traffic in the middle of the road, it took 2 hours for a tow truck. The worst day ever. I couldnt believe how easy it was to install, thanks for the help

Tue, Apr-20-2010, 03:22:56 AM	#1
moe0001 Registered User Join Date: Mar 2009 Posts: 549 Reputation: 0 Location: edmonton,ab	alternator so my battery light comes on car dies, so i get the car towed to my house i change the alternator and battery the light still comes on, could the alternator not be the rite one it fit perfectly in all ways any ideas? Last edited by moe0001; Tue, Apr-20-2010 at 03:39:44 AM.

Tue, Apr-20-2010, 08:26:35 PM	#4
Gregs///M Registered User Join Date: Dec 2008 Posts: 1,688 Reputation: 0 Location: SF Bay Area	Make sure your battery connections are clean and grip the posts very hard. __________________ 2003 Alpine White BMW M3 Coupe Modifications:Dice Ipod Interface [] Focal Utopia 6.5in components speakers(front), Focal Utopia 5.25in component speakers (rear) []JL Audio W3V3 Sub Woofer [] Eclipse Xa5000 5 ch amplifier [] Clifford 50.7 two way pager [] Custom interior trim (OEM Alcantara) [] Dinan Stage I tune. []

Tue, Apr-20-2010, 11:22:25 PM	#5
deilenberger Moderator Join Date: Dec 2004 Posts: 13,332 Reputation: 578	Won't do a thing. The red alternator light is turned on when there is a difference between the alternator output and the system voltage. If it comes on (read the sticky..) the alternator is not making current. It's dead, kaput, passed on, nailed to the perch. So far - in about 100 of the times this has come up - 100 of them have been the alternator is bad. Odds are awfully good the "rebuild" came from a chain auto parts store - where a rebuild generally consists of getting them from a junkyard and painting them so they look pretty. That seems to be the rather common scenerio. Only other possibility is the wires are hooked up wrong, but that's doubtful since they only can be connected one way (unless you are VERY VERY forceful.) __________________ Don Eilenberger AKA bellymeisterburgermeister and denilegiiiiiiiiiiiiibennnnegerieragher (but that's misspelled..) 2001 M-Coupe - TiSilver/Black - Das Boot.. 2002 M3C/6 - Imola Red/Black - SOLD 2003 525iT - Green/Tan - SOLD - replaced with Lexus 2006 Cayenne/S - Iceland Silver Metallic/Stone-steel Gray - Truckster. 2007 R1200R - Roadster, black mit/white pinstripes - the REAL BMW.. 2011 Lexus RX-350. SWMBO's new toy.

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Tue, Apr-20-2010, 06:33:42 PM	#2
deilenberger Moderator Join Date: Dec 2004 Posts: 13,332 Reputation: 578	Where did you get the replacement from? If it's not rebuilt by Bosch - it's likely crap. Or you could have screwed up the installation. BTW - adding "!!!!!!!!!!" to your thread title does two things (1) pisses me off (2) makes you look like a child. #2 is probably why you've received no responses to your posting. __________________ Don Eilenberger AKA bellymeisterburgermeister and denilegiiiiiiiiiiiiibennnnegerieragher (but that's misspelled..) 2001 M-Coupe - TiSilver/Black - Das Boot.. 2002 M3C/6 - Imola Red/Black - SOLD 2003 525iT - Green/Tan - SOLD - replaced with Lexus 2006 Cayenne/S - Iceland Silver Metallic/Stone-steel Gray - Truckster. 2007 R1200R - Roadster, black mit/white pinstripes - the REAL BMW.. 2011 Lexus RX-350. SWMBO's new toy.

Tue, Apr-20-2010, 06:54:55 PM	#3
Raster22 Registered User Join Date: Mar 2010 Posts: 40 Reputation: 0	I would suspect the voltage regulator in the alternator. Is it a name brand replacement?

Thu, Apr-22-2010, 05:48:01 AM	#6
moe0001 Registered User Join Date: Mar 2009 Posts: 549 Reputation: 0 Location: edmonton,ab	It turns out it was faulty, it was my first time going to this parts store everywhere else needed 3 to 4 days, I bought one out of a parted out m3 in the city. Every things working great now. Sorry for the !!!!! that is just how i felt, the light came and died while i was on a highway in busy traffic in the middle of the road, it took 2 hours for a tow truck. The worst day ever. I couldnt believe how easy it was to install, thanks for the help