E46 325ti Compact Sport - Possible Alternator/Voltage Regulator/Battery/Parasitic Drain problems?

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  • Battery

    1 100.00%
  • Alternator

    0 0%
  • Voltage Regulator

    0 0%
  • Parasitic Drain

    0 0%
  • Other

    0 0%
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Thread: E46 325ti Compact Sport - Possible Alternator/Voltage Regulator/Battery/Parasitic Drain problems?

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  1. E46 325ti Compact Sport - Possible Alternator/Voltage Regulator/Battery/Parasitic Drain problems? 
    #1
    Bimmer Fan
    Car Details
    doggtoffy's Car Details
    Model of Car:
    325ti SE compact sport
    Year of Manufacture:
    03
    Transmission Type:
    Auto
    Car Body Type:
    hatchback
    doggtoffy's Avatar
    Join Date
    Feb 2010
    Location
    uk
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    Hello folks,
    Need an experts point of view here...
    Had a move abroad and my car has been off the road in a garage for nearly a year. It has been started and run occasionally to keep fresh.
    When I went to take it out today I ran into a problem.. No battery.. nothing.. no lights.. no click.. NOTHING...
    Not even enough to remote unlock... so i jump the car and take for a 30 min drive to charge battery.
    Whilst driving the dash warning lights were all going on at the same time at regular intervals.. something i have not experienced before.
    When I return I switch car off and try a re-start.. same problem... nothing.
    I ran a check on battery it was at 2.5v engine off
    I hooked up jumpers and started car.. tested battery.. it was 13.5v after a few moments. and up to 14.5 whilst reving a little bit.
    I thought it may have been Alternator problem as it was reading low (supposed to be at 14-14.5v) at tick over.
    Then I thought Battery as it's been sitting for a while.
    Then I read about the Voltage Reg.
    Then Parasitic Drains?
    Very Confused...
    Is there any more tests I can do to fine search the problem?
     
     

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  3.  
    #2
    BMW Maestro
    Car Details
    izzy_007's Car Details
    Model of Car:
    325
    Year of Manufacture:
    2001
    Transmission Type:
    manual
    Car Body Type:
    coupe

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    your battery or alternator
     
     

  4.  
    #3
    BMW Fanatic
    Car Details
    lee2011's Car Details
    Model of Car:
    728i
    Year of Manufacture:
    1999
    Transmission Type:
    auto
    Car Body Type:
    saloon

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    Battery. A 30 minute run would not be adequate to keep enough of a charge in the battery to start your car. It needs a full charge as the draw on it when starting is very high.
     
     

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    #4
    Bimmer Fan
    Car Details
    Alpha99's Car Details
    Model of Car:
    318I
    Year of Manufacture:
    1999
    Transmission Type:
    Manual
    Car Body Type:
    Saloon

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    May 2012
    Location
    Sweden
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    You have to start from somewhere, so it is a good idea now to start replacing the battery. If you have the original one it might be the time already anyway. But on the other side, it should not be that discharged, like 2.5V so this might be because of too thinks: 1) A bad battery or 2) a parasite. Whatever the cause is, if the battery reaches 2.5 V, is FUBAR, especially if you let the alternator to charge it. Probably it was boiling like hell while charging and now you probably have low water in it, if it`s that type and not a sealed one. So I would say, buy a new one, see if the problem persists, and if it does and your battery is dropping bellow 10V, charge it at a low current at a charger, not on the alternator. You can also do a quick search on google or youtube about how to find the parasite. Is not hard at all and if you have one, is probably a blocked relay.
     
     

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