Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #11  
Old 07-20-2019, 12:15 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 4,659
wpoll will become famous soon enough
Quote:
Originally Posted by Kingfisher View Post
Do you have the link or key words so I can search for it? Thanks!
Not sure which thread it was in but basically the B+ jump terminal under the hood was getting hot and was very corroded. The owner repalced the jump terminal with a new one, cleaned all the contacts and issue was solved.

It was also determined that on some cars the B+ from that battery actually connects to the alternator and the starter via this jump terminal, so it's electrical condition matters a lot.

Remeber to disconnect the battery B+ BEFORE goofing with the B+ jump terminal - or welding happens.
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote

Sponsored Links

  #12  
Old 07-20-2019, 12:16 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 4,659
wpoll will become famous soon enough
Quote:
Originally Posted by Kingfisher View Post
Do you have the link or key words so I can search for it? Thanks!
Found it...

https://xoutpost.com/bmw-sav-forums/...ch-solved.html
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #13  
Old 07-20-2019, 12:25 AM
Member
 
Join Date: Aug 2017
Location: Bozeman
Posts: 12
Kingfisher is on a distinguished road
Quote:
Originally Posted by wpoll View Post

Thanks much. My jumping B+ is connected to the alternator for sure cause it's getting alternator voltage, but I'm not sure if the battery cable is connected to the alternator via the jumping terminal. I'll do the jumping cable test first before anything else.
Reply With Quote
  #14  
Old 07-20-2019, 12:33 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 4,659
wpoll will become famous soon enough
Quote:
Originally Posted by Kingfisher View Post
Thanks much. My jumping B+ is connected to the alternator for sure cause it's getting alternator voltage, but I'm not sure if the battery cable is connected to the alternator via the jumping terminal. I'll do the jumping cable test first before anything else.
Another test you could try is a voltage drop test while cranking...

Using a multimeter, set to 20 volt range, connect the negaitve (black) lead to the B+ jump terminal and the positive lead (red) to the B+ battery terminal. Use any long wire to extend one of the leads - this wire wil carry almost zero current so it doesn't need to be a big wire.

Inital reading should be close to zero volts. Now crank the car and read the voltage that appears of the meter while cranking. Anything more than a volt or two indicates that the wiring from the battery to the jump terminal is faulty somewhere.
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #15  
Old 07-20-2019, 01:53 AM
Member
 
Join Date: Aug 2017
Location: Bozeman
Posts: 12
Kingfisher is on a distinguished road
Good news! I did the jumping cable test and it fired right up, alternator is also charging the battery. so we can be confident now that the issue is narrowed down some where on the battery cable?
Reply With Quote
  #16  
Old 07-20-2019, 02:11 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 4,659
wpoll will become famous soon enough
Quote:
Originally Posted by Kingfisher View Post
Good news! I did the jumping cable test and it fired right up, alternator is also charging the battery. so we can be confident now that the issue is narrowed down some where on the battery cable?
Great news!

Looking at this diagram there's not much left to check..



You're looking for any joint in the line from the battery B+ to the jump terminal. The BST is still the most likely culprit....
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #17  
Old 07-20-2019, 02:14 AM
Member
 
Join Date: Aug 2017
Location: Bozeman
Posts: 12
Kingfisher is on a distinguished road
Quote:
Originally Posted by wpoll View Post
Great news!

Looking at this diagram there's not much left to check..



You're looking for any joint in the line from the battery B+ to the jump terminal. The BST is still the most likely culprit....
Awesome diagram, exactly the same layout as my car. I'll check everything tomorrow when there's light. Thanks!
Reply With Quote
  #18  
Old 07-20-2019, 08:03 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 10,817
andrewwynn will become famous soon enough
The problem was discovered in the other thread because the B+ terminal got HOT from high resistance. There could also be a high resistance issue at the BST. Or just at the battery terminal itself classic post corrosion.


Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)
Reply With Quote
  #19  
Old 07-20-2019, 06:30 PM
Member
 
Join Date: Aug 2017
Location: Bozeman
Posts: 12
Kingfisher is on a distinguished road
Thanks so much for everyone's help. The issue is now resolved. It was indeed a bad connection on the B+ jumping terminal under the hood, the nut was very loose.
After a new battery and a starter I learned my lessons now to always diagnos the "small" things first.
Thanks again everyone!
Reply With Quote
  #20  
Old 07-20-2019, 06:40 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 4,659
wpoll will become famous soon enough
Quote:
Originally Posted by Kingfisher View Post
Thanks so much for everyone's help. The issue is now resolved. It was indeed a bad connection on the B+ jumping terminal under the hood, the nut was very loose.
After a new battery and a starter I learned my lessons now to always diagnos the "small" things first.
Thanks again everyone!
Hooray! Glad it's sorted...
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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





All times are GMT -4. The time now is 05:47 AM.
vBulletin, Copyright 2024, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
© 2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.