1999 E39 540i - Change battery = different car?

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  1. 1999 E39 540i - Change battery = different car? 
    #1
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    adam540's Car Details
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    Hi,

    Basically i changed my dead battery the other day and the following has happened;

    1. Traction control light is on constantly AGAIN. (!)

    2. Airbag light is now constantly on, why would a change of battery make this happen?

    3. While i was driving home the other day the speedo and computer backlights were going from bright to dim on their own! and everytime i switched on the main beam they would die??? But when i got home they were fine?!

    what the hell is going on?? please help
     
     

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    #2
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    Kevin Whittaker's Car Details
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    Have you tried disconnecting the battery and leaving it off for a while (30 mins)? Maybe it just needs to be "powered down" properly???
     
     

  4. Possible Cause For This 
    #3
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    Westfield1989's Car Details
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    Hi.

    Just a possible cause for this.

    Are you sure your battery leads are fitted tightly and securely (or is one of the clamps damaged/cracked).

    Any slight movement can cause voltage peaks & troughs that can upset electronics.

    This may not be the cause but it is worth a look.

    Lets hope it is that simple
     
     

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    #4
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    I hope so. Going to give it a check today, because i did notice that the positive terminal lead going to the battery didnt have a clamp (it was completely missing) so i'll have to source one!

    This car is such a baby, anything i do slightly out of the ordinary and it throws a fit!
     
     

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    #5
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    turned out to be a black wire that is fitted onto the +ve terminal of the battery. guess i must've broken it while changing the battery!
     
     

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    #6
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    Well at least it wasn't any major problem. So I wasn't far away from your problem. Had a similar problem years ago on a 205 GTi, battery terminal clamp had a crack in it and when you thought it was tight it would loosen of on its own while driving causing all sorts of wierd electrical events from dying completely to dash lights flickering. Glad you got it sorted.
     
     

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