Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
User Name
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

LinkBack Thread Tools Display Modes
Old 05-23-2019, 09:56 AM
Join Date: Jun 2013
Location: Virigina, USA
Posts: 2,276
StephenVA is on a distinguished road
Multiple posters have discovered that the POSITIVE jump point is loose causing all types of issues. I would recommend, as everyone else has, remove the positive nut, cleaning all contact surfaces and reinstalling. I would also recommend removing the battery, cleaning all terminal ends and ground contacts in the trunk as any POOR negative grounds will create all kinds of electrical hell within the vehicle up to and including part failures and low voltage relays, and modules failures.

The parts under the hood have been exposed to high heat soaks, water spray, and general corrosion for the past 15 years. Give everything a wrench turn after cleaning.

Voltage drop Test listed below
Attached Images

2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
Reply With Quote

Sponsored Links

Old 05-23-2019, 09:13 PM
Join Date: Nov 2014
Location: SF Bay Area
Posts: 1,095
oldskewel is on a distinguished road
And to experimentally verify that the jump port is in the circuit, I just did a quick test using my clamp ammeter on my 3.0i.

I clamped around the cable immediately to the starboard of the jump port cover.

When starting the engine, indicated current through that cable increased positively and then quickly (within about half a second) overloaded since it exceeded the 100-Amp range of my meter.

Then, following the start, while the engine was idling, current showed negative (driven by the 120A Valeo alternator, flowing back toward the battery) of 80 Amps, dropping to 60 after a few seconds, continuing to drop, which was enough to remove any doubt I may have had.

Like I said a couple of posts earlier, wiring diagrams on the internet show the 4.4i and the 3.0d having different setups (same as eachother, different vs. the 3.0i), where the jump port is at the end of the line. So in those cases, current won't flow past it except when jump starting or charging at the port.

But in the 3.0i, it's definitely in the normal path of high current. It makes perfect sense that any looseness or surface corrosion at the jump port would cause the port to get hot, and of course that should be fixed for many reasons.

Regarding the wiring diagram posted earlier, I think that branch coming off the alternator is just not there on my car. And I think the jump port is correctly indicated but mis-numbered as I suggested in that post.
2001 X5 3.0i, 190k miles, AT, owned since 2014
Reply With Quote
Old 05-26-2019, 07:57 PM
Join Date: May 2019
Location: Pennsylvania, USA
Posts: 3
sevet is on a distinguished road
Problem resolved.

Terminal replaced with one from a wreck.
Thanks for all of your help.

X5 is back up and running. Wire is cool to touch. Battery is charging again.
Terminall was originally very corroded. When I attempted to clean the copper loop at end of wire, it disintegrated.

Sorry. I couldn't get images to load in the post.

Last edited by sevet; 05-26-2019 at 08:21 PM. Reason: more complete answer.
Reply With Quote
Old 06-02-2019, 12:52 AM
Join Date: May 2019
Location: Orion Arm
Posts: 123
X5M-ISH is on a distinguished road
Originally Posted by sevet View Post
X5 is back up and running.
Much better. That other cable was pretty bad. Oxidization is like a cancer and can spread. While your cable end and nut are copper, the post is still some blend of felsic metal. The potential for electrolysis and oxidizaton still exists. If you’re in an area where the DOT salts the roads or are living on the coast, consider using a dialectic grease on all your grounds, battery terminal and alternator. The grease is hydrophobic and keeps the connections from corroding. Just dab it on your finger and thumb and smear it around.
Reply With Quote


wiring problem

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 10:23 PM.
vBulletin, Copyright 2020, 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.