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      10-08-2013, 11:47 AM   #5
Augster
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Drives: 2008 335i Sport
Join Date: Aug 2013
Location: Sandy Eggo

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At the positive jump terminal, aka Engine Compartment B+ Terminal Point, aka External Ignition Base Distributor:


  1. Remove protective cover 4.
  2. Remove 10mm nut on accessory B+ terminal 6.
  3. Remove 12mm nut holding alternator power cable onto stud 7.
  4. Move alternator power cable to stud 6.
  5. Reinstall nuts.
  6. Stow protective cover 4 until cable is reinstalled to stud 7.

Be advised the alternator power cable spade is wider than will fit between the two vertical plastic guide tabs that may be flanking stud 6 and will damage them (just cosmetic damage which protective cover 4 hides: doesn't really cause any other issues) unless spacers are added before the cable is installed (a pair of 3/8" washers will do).

This works if the fuse of the Power Distribution Box (the flat panel attached over the battery) hasn't blown.

WHY IT WORKS:
Stud 6 is directly connected to B+ portion of the positive battery cable, whereas stud 7 and the jump prong is connected to the BST portion of the positive battery cable. If the BST is blown, stud 7 is disconnected from the battery, but B+/stud 6 is not.



Because B+ cable is of a smaller diameter, this should be done only as a temporary bypass: the BST battery cable should be replaced as soon as possible to prevent potential overheating (and catastrophic meltdown) of the B+ cable.

Last edited by Augster; 10-08-2013 at 12:06 PM..
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