2004 530 Petrol E60 - Alternator / Charging Query

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Thread: 2004 530 Petrol E60 - Alternator / Charging Query

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  1. 2004 530 Petrol E60 - Alternator / Charging Query 
    #1
    Bimmer Fan
    Car Details
    bigandyneil's Car Details
    Model of Car:
    530SE
    Year of Manufacture:
    2004
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

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    Jun 2009
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    Aberdeenshire
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    Hi Guys.

    I'm having problems with my battery not being charged by the alternator and need some help.

    Symptoms are:
    New battery. Alternator bench tested all ok.

    Engine running, alternator all connected, voltmeter over the battery shows approx 13 volts, however you can watch this decay continuously. Battery will run flat in 1-2 days.

    Disconnecting the multi-pin plug on the top of the alternator, engine running, battery is getting a steady 13.8V charge.

    Multi-pin plug only has one wire, which is blue.

    What is this wire for? Can I leave the plug disconnected?
    Does anyone have a charging circuit / alternator wiring diagram in pdf format?

    Thanks
     
     

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    #2
    Dr of BMW gildersol's Avatar
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    The blue wire you mention goes to the DME (ECU) to monitor what the alternator is doing. It does say that if the alternator is being overloaded or if there is some other fault, the ECU will reduce the alternator voltage, which may be what you are seeing if disconnecting the wire causes the full caharging voltage. It's not fixing the fault though.
    You should be able to get the codes read at a BMW specialist (not necessarily the dealer).
    I'm not particularly familiar with this charging system but I have read elsewhere that the IBS (intelligent battery sensor) that was fitted to early models had a problem with water ingress which could result in the thing draining the battery.
    Last edited by gildersol; 22-06-2009 at 13:12. Reason: add more info
     
     

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