Alternator issues for Renault Laguna II
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  1. #1
    Tadpole
    Join Date
    Nov 2014
    Location
    Melbourne
    Posts
    6

    Default Alternator issues for Renault Laguna II

    Hi Everyone,

    I'm a new inductee to this forum and looking for some help with my Renault Laguna II (2001 3.0L V6). I also have a Peugeot 205 needing some attention but that's another story...

    The problem I'm having is giving me some grief, and hoping someone can shed some light on what might be happening and what I should look for before taking to the dealership for an inspection with CLIP.

    The symptom manifests itself with the failing of the voltage regulator. I have replaced it twice now, and they appear to be failing relatively soon after replacement.

    Originally, I discovered that the battery was draining while driving (a range of warnings were being triggered as it discharged - airbags, ABS etc) and subsequently found the alternator wasn't charging when checked with a multimeter. As the alternator is accessible, I removed the cover (of the Valeo CL12) and removed the voltage regulator to check the brushes. They looked worn to the point of potentially not making solid contact with the commutator (particularly on one side where the commutator wasn't showing polished copper), so I thought perhaps new brushes would suffice. I replaced brushes, but found I still had no charge. So I bought and fitted a new voltage regulator (worth a try rather than buying and having a new alternator fitted - or so I thought).

    It fixed the problem initially and there are no audible fault messages reported. Alternator was charging properly again and within the correct voltage range. It continued to work perfectly for another couple of months, and then failed again. Started getting audible warning about the charging system too. Alternator wasn't charging again when tested with multimeter. Thought I might have been unlucky with the new part (perhaps sitting on shelf for a while, but became suspicious that something else was at play). So, decided to fit a second hand voltage regulator this time from the same model alternator (and same numbers on voltage reg as original). Charging as per normal initially, but on first trip failed after about 1 hour of driving - audible warning again as well.

    Seems clear something else is happening to cause the voltage regulator to fail. Not sure whether it is associated with the alternator, or whether it might perhaps be a bad ground, or something else. Just wondering whether there are any tests I can run to check issues that might be typical of Renaults before calling in the specialists and hooking her up to CLIP ($$$). Could it also be a symptom of slightly overcharging perhaps? Or would that cause problems for the battery instead? Also wondering whether it could be related to incorrect signals from the ECU... (sounds expensive).

    The only other issue that I noticed that coincided to a degree was the small globe to the outer side of the front right headlight (within the headlight unit) failed. I have removed the bulb but not replaced it yet. Didn't think it would be causing the problem, but perhaps related?

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    My research suggests that it could perhaps be a bad earth somewhere, so I will check that next, but if this is not the cause I'm stumped!

    Any help or suggestions would be greatly appreciated.

    Thanks

  2. #2
    Tadpole
    Join Date
    Nov 2014
    Location
    Melbourne
    Posts
    6

    Default

    Anyone have any ideas..?

  3. #3
    COL
    COL is online now
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    Join Date
    Mar 2002
    Location
    Van Diemen's Land
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    Default

    Sorry, I have a Laguna 1 but its alternator is charging fine.

    You may need to find yourself a good auto sparky.
    Regards Col

    1973 Renault R12 Station Wagon
    1976 Renault R12 Station Wagon
    2002 Renault Laguna V6
    1973 Alpine A110

    http://alpine-a110.weebly.com/

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