e46 M3 2003 charging battery

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  1. e46 M3 2003 charging battery 
    #1
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    tonyg m3's Car Details
    Model of Car:
    e46 m3
    Year of Manufacture:
    2003
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    hi just wanted to know if its dangerous to charge a batery up, when the baterry is still connected to car? any help would be greatfull.
     
     

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    #2
    Dr of BMW gildersol's Avatar
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    There are different opinions on this one, but my advice would always be to disconnect the battery before connecting a charger as the electronics, such as the ECU etc could be damaged if the charger is in anyway faulty.

    However, check whether you will need a code for your stereo first.
     
     

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    #3
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    Ronnie's Car Details
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    Never too old, never too new
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    It will be safer to pull the battery off the car put you can charge it in the car, connect the leads up in the engine bay as it will be safer

    Also could you remember to add the vehicle details in the thread title next time as per forum rules please, I've done them for you this time
     
     

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