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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 Sat, May-11-2019, 12:58:18 AM   #11
WALKD_U
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Default Re: Dsc, abs, tire, brake light after new alternator

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AutoZone scanned it with their tester. Yesterday the alternator read 12v, today it read 14.1v so I'm not sure what's going on with it. Everything electrical that deals with the engine to run has been replaced in the past month. (Alternator, starter, fuel pump, relays and fuses) I plan on bringing it back Sunday if the battery lasts to see if everything is good, I could of just recieved a bad battery yesterday. Tomorrow I'm going to tear apart the driver side trunk, anything I should look for while I'm doing so?


I don't believe so? Although my alarm stopped chirpinga couple month back.




It's not stock. Turner power pulleys, b-spec tune, some other mods. Why such a high power alternator when the car only calls for 120amps? What brands did you use?

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My car pulls about 140-150amps at idle... APEX alternator is the brand I got.
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Old Sat, May-11-2019, 01:43:22 AM   #12
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Default Re: Dsc, abs, tire, brake light after new alternator

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AutoZone scanned it with their tester. Yesterday the alternator read 12v, today it read 14.1v so I'm not sure what's going on with it.
Re to 12V and 14.1V readings, were they measured by voltmeter and EXACTLY where, or from Autozone tool? Try to find out why the readings are not stable. This seems to be the cause for "dead" battery.

It's better for you just get a DVM voltmeter and measure right at the batt posts directly -- more accurate.

Regardless what alternator brand or power spec, as long as batt measured with 14V +/- couple volts with engine running [idle to 4000 rpm] then alternator is not the issue.
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Old Sat, May-11-2019, 01:17:56 PM   #13
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Default Re: Dsc, abs, tire, brake light after new alternator

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Re to 12V and 14.1V readings, were they measured by voltmeter and EXACTLY where, or from Autozone tool? Try to find out why the readings are not stable. This seems to be the cause for "dead" battery.



It's better for you just get a DVM voltmeter and measure right at the batt posts directly -- more accurate.



Regardless what alternator brand or power spec, as long as batt measured with 14V +/- couple volts with engine running [idle to 4000 rpm] then alternator is not the issue.
The tool they used connects to the battery and gets readings of everything from the battery

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Old Sat, May-11-2019, 06:41:38 PM   #14
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Default Re: Car going through batteries fast?

My experience was similar, and it turned out to be the voltage regulator.
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Old Sun, May-12-2019, 09:15:52 PM   #15
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Default Re: Car going through batteries fast?

Didn't notice anything in the trunk. Is it possible while running air condition that it can drain power? Before this battery I was sitting on my car during lunch and had the a.c running while at idle for awhile and had the lights pop up. I haven't done this with this battery afraid that doing that can cause another battery to fail.

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Old Mon, May-13-2019, 06:35:54 PM   #16
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Default Re: Car going through batteries fast?

With normal working alternator/batt, running AC while idling should not drain the batt.

As suggested before, the best way to troubleshoot this issue is to have a voltmeter and check at the battery posts with engine running. This test will verify alternator/regulator and the cable connection from alternator to the battery posts. Measure directly on the POSTS.
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Old Mon, May-13-2019, 11:28:52 PM   #17
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Default Re: Car going through batteries fast?

I'm going to buy a voltmeter tomorrow, also if I buy a voltage regulator where does it go? I been looking for a DIY but zero luck. Unless it's in the same location as all e46's

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Old Mon, May-13-2019, 11:44:18 PM   #18
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Default Re: Car going through batteries fast?

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I'm going to buy a voltmeter tomorrow, also if I buy a voltage regulator where does it go? I been looking for a DIY but zero luck. Unless it's in the same location as all e46's

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It is built-in in the alternator. You have to disassemble the alternator to change it out. It should be in the outer end-bell where all the terminals are located.
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Old Tue, May-14-2019, 01:05:05 AM   #19
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Default Re: Car going through batteries fast?

It's a regulator and brushes in one package, but regulator rarely went bad. High mileage cars normally have worn brushes / slip rings leading to not functioning. You can do a search and buy just the brushes for around $10. Remove the regulator package to check for slip ring condition.
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Old Tue, May-14-2019, 01:27:33 AM   #20
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Default Re: Car going through batteries fast?

Check to make sure the radio and/or amplifier are not on when the car is off.
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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)