Battery Draines Overnight - BMW Forum - BimmerWerkz.com
1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 07-07-2005, 08:43 AM
n00b
 
Join Date: Jun 2005
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dand65 is an unknown quantity at this point
(Thread Starter)
I have a 1987 L6, and recently I thought the battery was bad and purchased a new one. Installed new battery and the car started right up. But the next morning the battery was totally drained. removed the alternator and had it checked, it was in good condition. Tried everything like bare wires or loose connections. Last resort was I removed all the fuses while the car was running, except one that would kill the engine. Checked voltage the next day and it was at 12.5 and the car started. Does someone no how to fine the short through the fuses links that is causing the draining if the battery.. Thanks
dand65 is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 07-07-2005, 10:30 AM
3rd Gear Member
 
Join Date: Jul 2004
Location: Poquoson, VA
Posts: 591
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bear is an unknown quantity at this point
Take negative cable off of battery and hook multi meter between negative cable and battery negative post. With key off, amp draw should be in the 100ma or less range, if not, take fuses out one at at time until the amps drop into correct range mand you have isolated your culprit.
Bear is offline  
#3 (permalink) Old 07-11-2005, 12:24 AM
Moderator
 
Dirty_Tool's Avatar
 
Join Date: Apr 2004
Posts: 1,052
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute
Bear is right on the money except that 100mA would be too high. Make sure you are under 50mA, that is the spec for e32.

DT

DT




Dirty_Tool is offline  
#4 (permalink) Old 08-01-2005, 02:01 PM
n00b
 
Join Date: Jun 2005
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dand65 is an unknown quantity at this point
(Thread Starter)
Quote:
Originally posted by Bear@Jul 7 2005, 08:30 AM
Take negative cable off of battery and hook multi meter between negative cable and battery negative post. With key off, amp draw should be in the 100ma or less range, if not, take fuses out one at at time until the amps drop into correct range mand you have isolated your culprit.
[snapback]360323[/snapback]
Bear, I did what you suggested and I did find the fuse which was reading 158 ma, The fuse line was for the interior lights, radio etc fuse# 21 7.5 amp. I removed that one fuse and the Ma reading dropped to 100 Ma. I connected the battery and read the voltage and it was steady at 12.40V. The next day I went and try to start the car, but it was dead. Please give me your input what could have caused this. Thanks.
dand65 is offline  
#5 (permalink) Old 08-01-2005, 02:09 PM
n00b
 
Join Date: Jun 2005
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dand65 is an unknown quantity at this point
(Thread Starter)
Quote:
Originally posted by Dirty_Tool@Jul 10 2005, 10:24 PM
Bear is right on the money except that 100mA would be too high. Make sure you are under 50mA, that is the spec for e32.

DT
[snapback]361407[/snapback]
Dirty, The time when this all happened was when I removed the antena and try to replace it with another type. not a BMW part. I coul not use the antena, because the connector going to the radio was not the same type. So I cut the cable and connected them together , but the reception was still bad, I decided to just do with out the radio. Could this be the reason of draining the battery
dand65 is offline  
#6 (permalink) Old 08-01-2005, 02:16 PM
Moderator
 
Dirty_Tool's Avatar
 
Join Date: Apr 2004
Posts: 1,052
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute
Could be..... the thing to do is after you removed the fuse that dropped the battery draw down to 100mA keep going with removing fuses until you get the draw down below 50mA. Once you have the draw down to an acceptable level then take note of the fuses. Using a wiring diagram see what exactly these fuses drive and then disconnect components 1 by 1 until you find the individual component that is causing the draw. Repair or replace this component. You may have more than 1 component causing the problem. Since you know this all started after replacing the antenna start by disconnecting the antenna 1st and then maybe the radio and see if the draw goes down to an acceptable level. Remember 100mA is NOT an acceptable level.

DT

DT




Dirty_Tool is offline  
#7 (permalink) Old 08-12-2005, 12:57 PM
n00b
 
Join Date: Jun 2005
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dand65 is an unknown quantity at this point
(Thread Starter)
Quote:
Originally posted by Dirty_Tool@Aug 1 2005, 12:16 PM
Could be..... the thing to do is after you removed the fuse that dropped the battery draw down to 100mA keep going with removing fuses until you get the draw down below 50mA. Once you have the draw down to an acceptable level then take note of the fuses. Using a wiring diagram see what exactly these fuses drive and then disconnect components 1 by 1 until you find the individual component that is causing the draw. Repair or replace this component. You may have more than 1 component causing the problem. Since you know this all started after replacing the antenna start by disconnecting the antenna 1st and then maybe the radio and see if the draw goes down to an acceptable level. Remember 100mA is NOT an acceptable level.

DT
[snapback]366639[/snapback]
DT, It seems what is causing the draw is the passenger power seat adjustment switch, can a bad a bad switch drain this much voltage. Thanks ofr all the INFO.
dand65 is offline  
#8 (permalink) Old 08-12-2005, 01:38 PM
Moderator
 
Dirty_Tool's Avatar
 
Join Date: Apr 2004
Posts: 1,052
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute Dirty_Tool has a reputation beyond repute
dand65,

What is most likely happening is the switch is jamming in to the on position and running the seat motor in whichever direction until it reached the end of its travel and then continuing to send current through the motor after it has reached the end of its travel. This would be a HUGE load and would drain the battery extremely fast. i have seen this happen several times before. The switch may be internally faulty or it may just be catching on the plastic seat trim panel and hanging up. I gather that you must have disconnected the switch and now the draw has gone away and the battery stays charged? If this is the case repair or replace the switch and you should be ok.

DT

DT




Dirty_Tool is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper


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
Definition of "Irony" (new battery for the 540) Eric S. 5-Series (E12,E28, E34, E39, E60) 2 10-23-2005 09:18 PM
318i-Not charging Hypnogaja 3-Series (E21, E30) 15 10-27-2004 03:18 PM
Help - Battery Light Is On (again) Pegasus 3-Series (E36) 6 10-01-2004 11:14 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