bad alternator ?

[Takimo]

so i bought the cigarette volt display , and i saw that my alternator is 13.8v at full load and 14v with accesory turn off, is it still good or no ?

[upallnight]

It is fine.

[andrewwynn]

0.2v variance is excellent. The exact values aren't as important.

I'm used to seeing a value of 13.4 ±0.2 on my OBC display but my new alternator is about 0.4v higher.

[Takimo]

cool, thanks i guess i have a parasite draw then, try to figure out why my battery drop from 12.7 to 11.8 overnight

[andrewwynn]

Start with FSU/hedge hog. That's the #1 culprit for no good reason BMW supplies power to the thing even with key off so when it's starts to fall it can pull a lot of current when car is off.

[Fifty150hs]

Originally Posted by andrewwynn

Start with FSU/hedge hog. That's the #1 culprit for no good reason BMW supplies power to the thing even with key off so when it's starts to fall it can pull a lot of current when car is off.

The other item to look at is the telematic control module (TCM). If you have bluetooth, you have one. They are prone to not going to sleep especially after an alternator failure for some reason. Pulling the fuse to it for a little bit then powering it back up usually fixes it. The NAV unit can also cause a drain if you have it. Same fix as the TCM.

[Takimo]

no bluetooth, i guess im good. anyone heard about the little trick to test the FSU, is to put whaetver setting hvac , like 28c and 2 bar fan, leave it like that, turn off the car and if the next morning when you start the car the setting change = psu is dead... is it a good way to tell?

[Overboost]

Your 2006 has the telematics control module. It could definitely be worth unplugging fuse 74 in the back. Since you don't have Bluetooth set to your phone, you have no loss of features.

This was certainly my cause of battery drain a few years ago.

[Takimo]

will try that for sure, what this thing control ??? for non bluetooth model

[Overboost]

I'm pretty sure you have the Bluetooth module, you have just never set your phone Bluetooth settings to use it. I think that module is on all LCI models.