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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, May-14-2019, 12:50:13 PM   #21
11b4
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Default Re: Car going through batteries fast?

This morning on my way to work the dsc, brake, abs, and tire light came on. Luckily it was right before I pulled into the parking lot. I noticed my radio cut out first. Then the dash lights followed a couple minutes after. Then a couple hours after PT I went to get gas, car started up fine then a minute or two later the radio cuts out followed by dash lights. This time the brake light flashing red. The alternator is defiently failing. I'm about to overnight a alternator so I'm asking for feedback here. Are remanufactured Bosch alternators reliable? All I'm finding is new valeo, new oem and remanned Bosch I have a new valeo and it's obviously not working. I'm not going to throw $600+ and a oem alternator just because it has a bmw logo on it.

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Old Tue, May-14-2019, 02:08:26 PM   #22
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Default Re: Car going through batteries fast?

Valeo is the OEM for M3 alternators. If your Valeo is new, ask for a replacement.

Avoid reman Bosch alternators like the plague, too many issues with them (ironically enough)

I would also double check to make sure all the connectors are tight (including all ground straps) and wiring is in good condition.
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Old Tue, May-14-2019, 02:46:01 PM   #23
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Default Re: Car going through batteries fast?

If you haven't already found the source of the pop do that, and keep a fire extinguisher handy in case your + lead is shorting somewhere... maybe I'm a bit paranoid.

It's also worth chasing parasitic draw once you have a multimeter. If you have a problem caused by a short, then you will probably see that when looking for parasitic draw.
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Old Tue, May-14-2019, 02:47:41 PM   #24
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Default Re: Car going through batteries fast?

If you don’t want to throw another $600 then don’t buy another alternator until having the proof. It’s not enough to blame the alternator.
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Old Tue, May-14-2019, 05:35:18 PM   #25
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Default Re: Car going through batteries fast?

Quote:
Originally Posted by 11b4 View Post
This morning on my way to work the dsc, brake, abs, and tire light came on. Luckily it was right before I pulled into the parking lot. I noticed my radio cut out first. Then the dash lights followed a couple minutes after. Then a couple hours after PT I went to get gas, car started up fine then a minute or two later the radio cuts out followed by dash lights. This time the brake light flashing red. The alternator is defiently failing. I'm about to overnight a alternator so I'm asking for feedback here. Are remanufactured Bosch alternators reliable? All I'm finding is new valeo, new oem and remanned Bosch I have a new valeo and it's obviously not working. I'm not going to throw $600+ and a oem alternator just because it has a bmw logo on it.

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Someone I know had problems like this with their e36 a few years ago. Positive battery cable (that runs from the battery in the truck through to the front of the car) was worn through and was shorting out on the body of the car.

These cars are very sensitive to voltage drops and it sounds like that is what you're experiencing. I agree with the other guy, keep an extinguisher and check your wiring for shorts, particularly the main positive cable.

Last edited by hbalzanya69; Tue, May-14-2019 at 06:05:19 PM.
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Old Tue, May-14-2019, 05:43:05 PM   #26
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Default Re: Car going through batteries fast?

Yeah I’m not convinced you have a bad alternator just yet. Sounds more like you have a short resulting in very high battery draw. Measure that current draw before throwing parts at it
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Old Tue, May-14-2019, 05:55:17 PM   #27
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Default Re: Car going through batteries fast?

In any case...once you figure out what's causing it and get it fixed and need to replace the alternator, new Valeo unit for $206.
https://www.fcpeuro.com/products/bmw...317831436#desc

But do find out what is causing it first before you stick another one. There is a reason why alternator is giving out (same with your battery for that matter). Less than 24-hours for a battery and it died? There is something serious going on and needs to be resolved first.
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Old Wed, May-15-2019, 12:02:28 AM   #28
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Default Re: Car going through batteries fast?

I am stupid... I didn't fully connect this or it came undone after a month or so.. probably the first one. Going to let the car idle and get everything tested out. Sorry for wasting people's time.

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Old Wed, May-15-2019, 12:25:16 AM   #29
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Default Re: Car going through batteries fast?

Naah! you just exercised our brain cells...
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Old Wed, May-15-2019, 05:54:03 PM   #30
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Default Re: Car going through batteries fast?

That connector has 2 wires: one for feeding the 12V to the regulator which manages the rotor current to generate the charging voltage; the other wire connected to the DME. With the connector opened the alternator is a dead duck.
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Discussing Car going through batteries fast? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)