Bimmerfest - BMW Forums - View Single Post - Getting her back on the road
View Single Post
Old 01-15-2013, 10:48 AM
Monsignor's Avatar
Monsignor Monsignor is offline
BMW CCA Memeber #445389
Location: Pineapple Under the Sea
Join Date: Oct 2009
Posts: 3,285
Mein Auto: Sig
Originally Posted by BMR_LVR View Post
From my limited electrical knowledge, but based on what many mechanics have told me, the alternator is not designed to charge a battery, but maintain the charge. It is very hard on the alternator to run the car with a flat or discharged battery. That is likely why you were getting a rough idle ... not enough juice to the DME when the battery was flat.

May I suggest that you remove your battery and take it to Autozone or the like and have it tested. They should probably be able to tell you if you have a dead cell or similar.

If that is the case, get a new battery and put it in the car. Crank the engine and check the voltage. It should be 13.8v+. If so, then your battery was the culprit.
I like this idea the best. I was starting to worry that every start was a jump because i only drive the car so rarely. When i had absolutely no power today my heart just sank. Hopefully my alternator is still in good nick. If not you gents will be getting a special treat, alternator rebuild DIY!! lol.

1995 525iA 250k mi
2003 350Z 90k mi FOR SALE
2014 F-150 9k mi

Instagram: @Titan_E34
Snapchat: Titan_E34
Reply With Quote