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Old 08-19-2012, 12:15 PM   #1
Marmaz16
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Question Electrical Issue/Alternator/Battery/HELP!

Hey there sorta new to forums, been a lurker for a while. I have searched i have done some repairs to my vehicle to here is my story.

My e46 is having a charging/electrical issue. I originally had the red battery warning lights last week. So i thought alternator or battery. i got both checked at autozone said were fine but i went ahead and replaced the Alternator. The battery charged fine but it possibly could be old and dead as well.

Now with new alternator it does not keep a charge, same issues except no red battery light. The volts just drop. I have a charge the battery and the Volts slowly drop when it is running. I left the car sit running for 20+mins and eventually died and would not restart, low voltage read out in dash. i used the whole OBC 19 then 9.0 to read volts.

I have been reading and few possibilities and i need some clarity. I read it can possibly be the Final Stage Regulator? About month or more ago my A/C and vents completely stopped working and i found that may be cause, but German engineering caused the issue to fix itself in 3days.

It can also be a bad ground or wiring issues. the battery tray and inside the engine bay wires seem fine, no abrasion or corrosion and tight fit. So idk if its under the car or the ground running from engine bay to the battery?

Any ideas? suggestions? or should i just take it to the damn Stealer ship already?
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Old 08-19-2012, 12:54 PM   #2
haurelio
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how old is the battery?

the FSR does contribute to the draining of the battery, I would just change that also since is showing failure signs.
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Old 08-19-2012, 01:23 PM   #3
Marmaz16
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I honestly dont know how old it is. I was lookign for a sticker or tag on the battery to no avail. I bought the car 2 years ago, has low miles 65k and its a 2002. It may have never been changed. Any markings on it i could look for? Again i got it trsted at Autozone and charged and they said it was fine.
Random but apparently the ppl at autozone have never seen a BMW battery before, thought it was futuristic...
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Old 08-19-2012, 02:08 PM   #4
Alex323Ci
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well that definitely sounds like a charging issue. the car should be getting power from the alternator when running. since it isn't it appears that it's drawing from the battery until dead. when you replaced your alternator did you use the old regulator or did they supply a new one?
First thing I would check is the ground wires on the alternator and engine.
Check the wiring on the alternator harness.
Sorry I cant be more help but those places could be the easy find.
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Old 08-19-2012, 02:17 PM   #5
jfoj
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Engine to body ground strap, usually has problems on the body side. It is near the passenger side motor mount.

Also make sure your FSU is not an issue, search FSU on the forum here.

http://forum.e46fanatics.com/showthr...ghlight=ground

Also check my signature below for the Hidden OBC menu link, bring the charging Voltage directly up on your dash. 13.2 Volts or higher on the OBC display usually means a good alternator. Note that I allow for 0.3 Volt drop within the car, at the battery you should have at least 13.5 Volts when the engine is running.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 08-19-2012, 04:35 PM   #6
Marmaz16
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Quote:
Originally Posted by Alex323Ci View Post
when you replaced your alternator did you use the old regulator or did they supply a new one?
I put in a new alternator
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Old 08-20-2012, 04:36 PM   #7
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Minor update. Took bimmer to local trusted mechanic near my house. I was able to jump it and get it there. He took a look at it while at work checked new alternator any power issues or drains. couldnt find any generic codes or errors. One weird issue he found was when he disconnects the alternator the bmw computer shows that the car is getting charged or charging. So he suggests that it could be a electric/computer issue and To go to a local dealer and have them either read diagnostics and see what they may find or that the internal Pc may need to be reset. or in worst case completely shot....

Idk is any of this info is helpful or useful to explain more into what happening. Any idea feel free to let me know.
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Old 08-23-2012, 10:12 AM   #8
Marmaz16
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Bump. took it to stealership today, awaiting Diag
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Old 08-23-2012, 01:26 PM   #9
Marmaz16
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Had my father go to dealership for im still at work actually. Ill post this in Shops section but....

DO NOT GO TO WYOMING VALLEY BMW in Kingston,PA on Market St EVER.

They refused to even try running a Diagnostics test before buying a new $253 battery. My dad went out way to get a Walmart/Sams club battery. They refused to let him put battery in on the dealers lot and they refused to give back the Keys and his license until he paid the $100 for the Diagostics they didnt even run yet. I wasnt there but he suposedly put on a **** show to the managers and they let him get keys and license back to replace the battery. They also informed him to Take his service and work to another Garage down the street and never come back, The additional comment was not needed for i will never return. Ill keep updated on How the new battery works out.

PS> if anyone knows of some BMW shops around NEPA it be appreciated too

Last edited by Marmaz16; 08-23-2012 at 01:27 PM.
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Old 08-23-2012, 01:36 PM   #10
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Who knew the dealership would try to pull something like this?
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Old 08-25-2012, 05:36 AM   #11
Alex323Ci
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yikes what's the latest update?
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Old 08-25-2012, 06:14 PM   #12
Marmaz16
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Quote:
Originally Posted by Alex323Ci View Post
yikes what's the latest update?
Didnt mean to bump this but....

Made a new thread after i replaced items, This can be deleted or just DONT POST, just to remind ppl.

http://forum.e46fanatics.com/showthr...429&highlight=

New post
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