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My name is ***** *****. I recently purchased a 2004 745i. It

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Customer: Hi. My name is...
Customer: Hi. My name is ***** *****. I recently purchased a 2004 745i. It drove and handled like brand new when i first got it. But now after its been running for a few minutes it does weird things. First it will have a message on cluster saying dynamic stability issue. then trans fail safe mode. then the whole dash will go blank. the one thing i have noticed is when it does this weird stuff the charging system will be over charging the batt. like at 18 - 20 v.
JA: Thanks. Can you give me any more details about your issue?
Customer: yes the Batt is brand new. and at times the trunk smells like acid. If i leave the climate control system and the entertainment system turned off it takes longer to act up
JA: OK got it. Last thing – JustAnswer charges a fee (generally around $18) to post your type of question to BMW Experts (you only pay if satisfied). There are a couple customers ahead of you. We can help you for less if you're not in a rush. Are you willing to wait a bit?
Customer: sure thing
JA: OK. Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 2 years ago.Category: BMW
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Answered in 1 hour by:
10/10/2015
BMW Mechanic: Kevin, BMW Mechanic replied 2 years ago
Kevin
Kevin, BMW Mechanic
Category: BMW
Satisfied Customers: 2,441
Experience: Diagnostic technician
Verified

Hi I'm Kevin sorry to hear of your troubles where and how are you checking the charging voltage?

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Customer reply replied 2 years ago
Hi Kevin. Well ive checked the voltage multiple ways. at the batt. at the jumpstart post under the hood, and also at the back of the Alt. charging voltage after start uo is approx 13.6. but when the dynamic stability light comes on or the trans. failsafe message comes on the voltage is always like 18 or higher.
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
BMW Mechanic: Kevin, BMW Mechanic replied 2 years ago

Hi sorry for the delay this indicates that the voltage regulator on the alternator is failing and at times overcharging .i would not recommend running vehicle until a new alternator is fitted as overcharging can cause irreversible damage to computer systems

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Kevin
Kevin
Kevin, BMW Mechanic
Category: BMW
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