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Thread: Red battery light on the dash. Anyone had this happen?

  1. #26
    Join Date
    Jun 2017
    Location
    Half Moon Bay California
    Posts
    1
    My Cars
    1997 z3
    First of all how do you post a new thread to this forum?
    second, my battery light came on and when I tried to remove the positive battery clamp it snapped.
    Can I replace this myself and where do I find this special battery clamp?
    I will be checking the battery and if I can replace the clamp myself checking the alternator.
    Any ideas?
    Thanks.

    ~Michelle '97 Z3

  2. #27
    Join Date
    Jul 2008
    Location
    Fairdale, ND
    Posts
    889
    My Cars
    2004 325xi
    agreed the symptoms you described are a failed alternator which led to a discharged battery. Battery is old and everytime you discharge a battery you take some of its usefull life away from it. This is not exact.... but for instance if you take a new battery charge it to 100 percent, completely discharge it and try to charge it again it will only reach a state of about 90-95 percent. and so on and so on... add some heat to the mix (phoenix comes to mind) and it is worse.

    When you light came on there was a problem, but since you drove the car and had voltage to run the engine, computer, fuel injection and what ever the battery was holding a charge. till the draw on battery deminished the battery and at that point you get the bogging and stumbling then nothing car is dead.

    There are 4 different alternators fitted to e46 Valeo or Bosch 100 or 120 amp. with and without cooler duct. typically you can tell if you have a 120 by the accessories like heated seats. ect there should be a sticker on back of alternator but name will be moulded into back cover. Like previously stated its a good time to check all the pulleys belts and oil filter housing. fix what is needed. its simple to replace but be sure you remove the battery neg cable from battery to prevent any sort of misshap you might come accross like accidently touching the B+ cable to something grounded....

    Before you first start the new alternator be sure to fully charge or replace the battery or you will damage the new alternator brushes.
    Level 1 Certified BMW tech.

  3. #28
    Join Date
    Jul 2008
    Location
    Fairdale, ND
    Posts
    889
    My Cars
    2004 325xi
    you said the positive battery clamp snapped? the 8mm nut snapped off?? is that what happened. if this is the case you have to replace the battery cable to get the t bolt and nut. the positive side has the BST built in and is a pain........ but the negative side is the same so go to a dealer and ask for a new negative side battery cable. take the t bolt and nut off and put on positive side. fixed. and they only get tightned to 10Nm.
    Level 1 Certified BMW tech.

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