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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today! |
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12-07-2012, 06:29 AM
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#1 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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battery light
Today while i was driving my battery light came on. It stayed illuminated while i was driving. When i stopped i popped the hood and looked at the alternator. The belt is good. Is my battery dying? there has been times when i try to lock or unlock my car and.i have to push the button a couple of times. And another question. Could a low battery cause my tps sensors to not communicate and set iff my eml light? Plz help
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12-07-2012, 07:26 AM
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#2 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Maybe i should say also, that i was in second gear. I pushed my sport button to pass some traffic and thats when the battery light came on
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12-07-2012, 08:02 AM
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#3 |
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"Have some candy!!"
Join Date: Sep 2002
Location: City of Angels
Posts: 6,205
My Ride: 2003 Technik S1 M3
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keep an eye out. Once the battery light started illuminating, in about a few days I ended up getting stuck by the side of the freeway as the battery drained due to a failed alternator.
I rebuilt the alternator for like a hundred dollars and it failed on me within a week.
__________________
 Bimmerfest 2013 Photos here!!! "The road was miles ahead..It fell away, now I'm at thee end... Just a sky, the fall, and you..I got holes in my para~chute...... Then-you-say,' never gonna find all the answers~ answers will find you..Don't know how I'll feel tomorrow~ Don't know the truth. But we can lie,.. lie.., lie.., lie here together..lie..,lie..,lie..,lie here together..'" |
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12-07-2012, 08:35 AM
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#4 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Yea my indy shop said 690+tax for new altenator. Anyone wanna buy an m3 with a new clutch? i cant take this anymore and neither can my bank account
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12-07-2012, 08:42 AM
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#5 |
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Registered User
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Didn't you just get your car?
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12-07-2012, 08:49 AM
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#6 |
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"Have some candy!!"
Join Date: Sep 2002
Location: City of Angels
Posts: 6,205
My Ride: 2003 Technik S1 M3
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Just make sure if it is the alternator(have it tested at a shop, usually free of charge) make sure you get a new alternator instead of a rebuild. ANd try avoiding draing the good battery. Its bad enough the alternator is going out, no need to buy an extra battery.
__________________
Bimmerfest 2013 Photos here!!! "The road was miles ahead..It fell away, now I'm at thee end... Just a sky, the fall, and you..I got holes in my para~chute...... Then-you-say,' never gonna find all the answers~ answers will find you..Don't know how I'll feel tomorrow~ Don't know the truth. But we can lie,.. lie.., lie.., lie here together..lie..,lie..,lie..,lie here together..'" |
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12-07-2012, 09:15 AM
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#7 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Yea +1 on not getting a rebuilt. It will b oem. Yea i've had the car for 4 months and i've had to put in a new clutch, i need my tps sensors replaced and now the altenator. So like 3k i've had to spend on it in the past month the tps sensors r gonna get done when my alt gets replaced. This is my dream car but god damn it, its becoming a nightmare
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12-07-2012, 10:44 AM
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#8 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Can someone point me in the right direction for a diy replacing my alt thanx
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12-07-2012, 11:08 AM
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#9 | |
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Fully Deeked Out
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Quote:
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12-07-2012, 12:01 PM
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#10 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Will b close to 3k after alt install. How do i test? Me and my car r about 35 miles from home. My voltmeter is at home.
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12-07-2012, 02:51 PM
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#11 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Ok omw home from work. Car is completly warmed up, and the batt light has been off the whole time. All electronics inside my car are off, except for my heat. Its cold. 30 miles to go. Wish me luck lol
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12-07-2012, 04:21 PM
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#12 |
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"Have some candy!!"
Join Date: Sep 2002
Location: City of Angels
Posts: 6,205
My Ride: 2003 Technik S1 M3
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you can do the non smart way test it like I did(not recommended but I didnt really care) start car, pull the positive cable and see if the car stays on.
On new cars doing this will turn off the car as there are failsafes, but not in the e46. take it to an alternator shop/ independent
__________________
Bimmerfest 2013 Photos here!!! "The road was miles ahead..It fell away, now I'm at thee end... Just a sky, the fall, and you..I got holes in my para~chute...... Then-you-say,' never gonna find all the answers~ answers will find you..Don't know how I'll feel tomorrow~ Don't know the truth. But we can lie,.. lie.., lie.., lie here together..lie..,lie..,lie..,lie here together..'" |
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12-07-2012, 04:25 PM
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#13 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Alright Choxor u were right. Gonna go to autozone and get my alt tested. Made it home. Popped off the batt cover and saw the batt had a good charge to it, indicated by the green dot in the sight glass. Tested the batt. 12.5 v when car is off. 14.8-14.9 with car running hmmm...... Yea, gonna get them tested tomorrow
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12-07-2012, 05:42 PM
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#14 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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I just saw on youtube how to test the battery and alt using the test mode in the car. With the car off my volt reading was 12.5volts. Started the car and it went uo to 13.9-14.0. Turned on the heat, same thing. Radio on, stayed the same. Turned on headlights, 13.8-13.9volts. Turned on rear defrost and front defrost, 13.6-13.5volts. Turned on both seat heaters full blast, 13.5-13.4volts Reved the engine,13.7-13.8volts. Idled down, 13.5-13.6 with everything on. Is the alternator slowly starting to go?
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12-10-2012, 04:39 PM
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#15 |
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Registered User
Join Date: Feb 2012
Location: Jacksonville, FL
Posts: 112
My Ride: 2004 M3 Convertible
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It sounds like your alternator. My car had the light come on while driving to work. I drove to lunch and it was off. I took it to a good Indy, and they said it was charging like crazy. They took it for a spin and got the light to come on. It turns out it was working only sporadically. Things like that never get better, only worse. It was a touch over $500 for the alternator, belt and one pulley. These cars use a lot of juice, so once it craps out for good it'll strand you.
I believe all of the alternators for our cars are rebuilt these days, even the shiny one from the dealer. |
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12-10-2012, 05:14 PM
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#16 |
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Registered User
Join Date: Sep 2012
Location: forest hill, md
Posts: 152
My Ride: 2002 m3 convertible
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Yea im tryin to baby it now. Going in the shop on thursday. Gonna get my tps sensors replaced and my alt. Here goes another 1000 bucks. Oh well, at least i'll b able to feel my cars full power again. Havent felt it in like a month. Being that it was tps failing, then release bearing broke, got a new clutch, release bearing, shift fork and slave cylinder. And then the battery light came on. Well on the bright side i have all these new parts in my ///m. Lol. Not bad considering i only paid 15k for the car and will have put almost 3k into it. Still below my 20k max limit for a car lol
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