Featured E60 Electrical fun and games, negative battery lead

Discussion in '5 Series' started by eggnchips, Mar 5, 2019.

  1. eggnchips
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    eggnchips

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    Hi
    I have been away for a while but I wanted to post the latest on a problem I have been dealing with. Some while ago I got the dreaded set of fake alarms pointing to battery and / or alternator problems. Battery was confirmed ok and carly and my other code reader were pointing at the alternator. The alternator was duly changed and most of the faults disappeared but I was still seeing problems with the idrive and intermittent radio issues. We were convinced that the alternator was faulty so it was swapped out. We had exactly the same problems. One point to add was that my idle would surge at times and I would get the occasional red battery warning. What I did do was disconnect the IBS cable, this helped but didn't fix the issues. While we were going through all of this I noticed that the previous owner had not secured the battery and it looked like the negative cable had been hitting the bodywork, this was duly rectified but made no change. Today we had an auto electrician on it talking to BMW at the same time, it looks like the negative battery cable needs replacing. The parts on the negative cable that connect to the battery control a whole bunch operations. I had a look on ebay and it certainly looks like breakers have spotted that they are a good source of income. There are loads of do's and dont's on handling the cable. Once I have downloaded the document I will post it. In the meantime I have ordered one from ebay to see if it does the trick. If so I will order a new one.
     
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  2. RickT
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    RickT

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    I have simlair problems on my E60 when i had it, maybe a bit too late now, put the Alternator voltage regulator was a common part to fail, this bolted directly onto the side of the alternator and saved the cost of replacing the full unit. (I had 2 of these over the life of the car.)

    The other issue i had was the IBS, at the time it was around £180 from BMW. again this fixed the problem short term.

    I then started having issues with the Idrive unit failing to boot, i was convinced this was in fact a result of battery low voltage or bad earth, (even disconnected the towbar electrics as it was an after market unit) however in the end it was because the unit had become faulty.

    Another issue which caused a strain on the battery was due to the Glow plug control unit being faulty too, so the car 365 days a day always started up with no glow pulls, again taking a hit on the battery.

    What year is the car ?

    Good luck, i never did fix it.
     
  3. eggnchips
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    eggnchips

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    its a 2004 545i, and the new negative battery lead fixed the gremlins
     
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  4. RickT
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    RickT

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    Never got round to changing mine before the turbo went bang.

    Good result.
     
  5. eggnchips
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    eggnchips

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    £156 for a cable was a bit rich but it does a whole heap of stuff
     

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