Alternator Issues - BMW Forum -

3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

LinkBack Thread Tools Display Modes
post #1 of 1 (permalink) Old 02-26-2011, 11:21 PM Thread Starter
Mackay's Avatar
Join Date: Nov 2010
Location: Seattle, WA
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mackay is on a distinguished road
(Thread Starter)
Alternator Issues

I am guilty of always observing but never really posting on the forums, but alas, my time has come to start a thread. I was hoping to get some ideas as to what could be the problem or what I could do to determine it.

The Info:

About two months ago, the car was running quite strangely, and would sometimes not start. After buying a new starter and taking the effort to install it, still no better. I finally realize it is missing a ground strap at the motor mount and all is well. This all occurred about 4 months after an engine swap.

About two weeks ago I was noticing that the defroster would randomly turn off when the blower was at full and other electronics were on. The ABS light would flicker and the headlights would vary in brightness. I checked the battery and it was 75% discharged. I bought a new battery and, presto change-o, everything is well and good. At the end of the next day after I installed the new battery, I was driving home with blower, headlights, defrost, and radio on. I parked at a gas station, and when I cam back out to start the car it lugged as if the battery was near death (which it was). So I turned off all the systems and limped home.


When the key is in the run position but the engine is off, the charge light in the instrument cluster illuminates, but when the engine is running, the light is not lit. I have checked the voltage of the battery at idle, and it reads 13.5. The power from the battery to the B+ terminal reads 12.7 volts, same as the battery, but the smaller D+ terminal that runs through the charging light and the ignition switch reads ~.5. I purchased a brand new Bosch alternator that still does not charge the battery when installed. The voltage of the brand new alternator also reads ~.5 at the D+ terminal. I have exhaustively troubleshot the problem, trying all of the bentley procedures, as well as many ideas found online, in addition to the expansive Pelican Parts article and discussion on alternator issues. My next step is to pull the instrument cluster and check the charge bulb and relay, but I was wondering if anyone had any ideas or experience with issues of this nature?

Thank you,

Mackay is offline  
Sponsored Links

  BMW Forum - > BMW Model Specific Forums > 3-Series (E36)

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
alternator bmw_tibbzy 3-Series (E36) 8 02-20-2009 04:34 AM
Alternator jimma 3-Series (E36) 3 08-17-2005 01:54 PM
ALTERNATOR! help! M5power 5-Series (E12,E28, E34, E39, E60) 5 03-06-2004 11:24 AM
Alternator Mattitjah 3-Series (E36) 16 02-29-2004 02:57 PM
second alternator buuhh99 3-Series (E36) 2 02-08-2004 02:25 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome