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  #11  
Old 01-14-2013, 03:10 PM
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Thanks everyone for you time. Just wanted to give you an update. So, I checked and rechecked all the wirings around the alternator and nothing was loose. The car has been running just fine since the incident but I tell ya', I am a bit nervous to drive it. Let's just say AAA is on hold.

Since I have had the car for about 6 years, I remembered an incident a few years back when the same thing happened as I was making a u-turn. It only happened once about 4 1/2 years ago and that was it. Car came right back on after restarting and continued to work just fine.

I have to say that the concept of the voltage regulator "freaking out" if voltage surpasses 14v or something sound very plausible. The alternator is working just fine right now - I tested it under very heavy load - AC/heater/HID's/etc - and it held up with the voltage pretty well.

So, if I end up replacing the alternator, does the voltgage regular come with it? I know it can be bought as a separate unit but are they attached?

Thanks again for everyone's help!
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  #12  
Old 01-14-2013, 04:39 PM
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For piece of mind, have the fault memory read out by a GT1 style computer. The transmission computer should store an overvoltage fault if what I said is what happened. If it is not an automatic, then another computer on the K-Bus should also store a fault such as the body module or instrument cluster.
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  #13  
Old 01-14-2013, 05:50 PM
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Sounds good Killcrap. I have an OBD reader, I wonder if I can do it that way? I have scanned for codes already, which of course there weren't any.
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  #14  
Old 02-01-2017, 12:33 PM
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Does anyone know what actually fixed this issue? I am having the exact same symptoms with my 3.0.
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  #15  
Old 02-01-2017, 01:06 PM
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Do you have a light on the dash for SES or CEL? If you do, get it scan and post the results.
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  #16  
Old 02-01-2017, 01:31 PM
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Girlfriend leaned forward in the passenger seat. Car died immediately. Started right back up and got us home. Woke up in the AM, cold day, completely dead. No locks no cluster no electricity. Pulled battery + in trunk for 20 min and replace. Car started. Airbag light on. Turned off. Tried to start again next AM, same dead. I live rural and it's tough to get to mechanic. Any suggestions would help. Replaced ignition switch. No fix. On forum found to be possible battery, alternator, or occupancy mat.
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  #17  
Old 02-01-2017, 04:21 PM
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I have found out that the car can go completely dead when the battery loses its terminal (I have a post about it, but the issue was my fault). since you can pinpoint the issue to the "leaning forward" and then the airbag light coming on, I would suspect that something under the seat got shorted and killed some major electrical "artery" (I would hope that such an artery would have been fused!). With the airbag light on, I would suggest checking the wires around the airbag connectors (airbag related connectors are yellow throughout the car), the seat mat... The front seats can come off by unscrewing two bolts on the back and two nuts on the front, same size (don't remember the size though). Look for chaffed insulation on the wires, look for possible burn marks, smell.. The heated seats use some fat wires, as the heaters pull some juice, and if shorted, may wreak some havoc in electrical system.

Just give it a try, let us know what the results are... Good luck!
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E53 X5 4.6iS
147K mi - Sold May 2013
Tireprints left in:
USA, Nicaragua, Costa Rica, Panama, Russia

E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
K&N air filter
black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X

Last edited by TerminatorX5; 02-01-2017 at 04:23 PM. Reason: spelling and added yellow for airbag
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  #18  
Old 02-01-2017, 05:11 PM
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Thanks will report back
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