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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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Old 11-11-2012, 02:56 AM   #1
christiandflores
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Join Date: Oct 2009
Location: San Diego, CA
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Alternator Dying?

If you've seen similar issues please let me know. 2005 M3 E46 SMG

So my recent strange sound problem (strange grinding coming from belt drive area) got a turn for the worst. While driving back home, the red battery icon flashed a couple times and then stayed lit. A while later i notice a delay in shifting, where i have to shift twice for it change. after this the electronic assitive control lights lit up yellow ( brakes, stability, traction), air bag in red. Here i noticed an instant loss of power in the accelerator pedal, would not respond. so i immediatly turn my hazards on and turn into a shopping center.

At a stop sign the car completley turns off when i used the brakes to slow down (which i now attribute to the car not wanting disengage the clutch when it was in 1st gear, thus stalling) A couple people help me push the car to a safe spot. I try turning the car again, it works but with a slow start up. i drive around the parking lot to see if what i can come up with. Delayed shifting, delayed clutch engagment/disengagment, the same lights come on again, the speedometer and tachometer freeze in place regardless of speed. eventually i deem the car too sketchy to drive home so i call a tow service and when the car gets home everything is fine minus the red battery light.

so what do you guys think? thanks in advance
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Old 11-12-2012, 12:05 PM   #2
christiandflores
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bump, no one can tell what this is?
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Old 11-12-2012, 12:25 PM   #3
justanotherone
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This might be cliché, but you should probably get the codes read and maybe go from there.
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Old 11-12-2012, 02:13 PM   #4
McGary911
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It does sound like your alternator did, in fact, die. Once they go, you're not going to get very far as the battery will soon become undercharged, and start lighting up your dash like a Christmas tree. The car will stop eventually.

It's easy for your shop to test the alternator. Mine was going from working to not working, working to not working....maybe that's the reason I made it to my shop, and wasn't parked in a lot like you were. If yours just plain old died, that could easily strand you.

The good news is that it's an easy fix. I had a shop do mine, as I was taking my GF away for the weekend the next day, but figure I could have done it myself. My shop charged me about $650 for everything, which included a new belt and the replacement of one of the pulleys that looked a touch iffy. The belt and pulley added about $70 to the cost.

Good luck. It should be a pretty simple deal.
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