Voltage Regulator problem - Renault Laguna 2001 V6
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Thread: Voltage Regulator problem - Renault Laguna 2001 V6

  1. #1
    Tadpole
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    Default Voltage Regulator problem - Renault Laguna 2001 V6

    Hi Everyone,

    I'm having a problem with the alternator's voltage regulator, it keeps getting cooked for some reason. She's just blown her third voltage regulator on a Valeo CL12 alternator.

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    Does anyone have any ideas where I could look next? I've done a voltage drop test, but all seems okay. I'm wondering whether the ECU could be frying it.

    If anyone has any ideas I could follow up on or knows of any tests I can do before taking it to an autoelec I'd be eternally grateful.

    Thanks,
    Keir

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    Hi,
    Perhaps if you give some more information on the fault and symptoms etc we could be more usefull. E.G. What does fry/cook actually mean ?
    Jaahn

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    Veni Vidi Posti 68 404's Avatar
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    It might be worthwhile buying a complete alternator from a wrecked Pug 406SV. There's a lot more of them around than the 'goons. It will of course have the regulator triodes built in and should be a simple multipin plug...

    Dave
    2008 Renault Laguna 2.0 dCi estate
    2013 Renault Koleos 2.0 dCi 4WD
    ​1997 BMW K1200RS

    IR655
    (George Bush Snr): "I'll never apologize for the United States of America. Ever, I don't care what the facts are."


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    1000+ Posts robmac's Avatar
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    regulator triodes built in
    Gee, I didn't think Laguna has thermionic valves in the alternator.
    jaahn likes this.

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    Contented Peugeot Driver addo's Avatar
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    It's a Class A device.

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    1000+ Posts robmac's Avatar
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    Quote Originally Posted by addo View Post
    It's a Class A device.
    I wonder where HT and filament supply comes from ?

    You are very much in my specialist area here, Having worked on many Westrex, RCA and N T S cinema amplifiers.

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    Veni Vidi Posti 68 404's Avatar
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    Quote Originally Posted by robmac View Post
    Gee, I didn't think Laguna has thermionic valves in the alternator.
    I said something wrong?

    My understanding was that a modern alternator had the regulator fitted to the side.

    Sorry for trying to help

    Dave
    2008 Renault Laguna 2.0 dCi estate
    2013 Renault Koleos 2.0 dCi 4WD
    ​1997 BMW K1200RS

    IR655
    (George Bush Snr): "I'll never apologize for the United States of America. Ever, I don't care what the facts are."


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    I think you meant to say 'diods'.
    "The enemy of knowledge is not ignorance, it's the illusion of knowledge"
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    1000+ Posts robmac's Avatar
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    Quote Originally Posted by JoBo View Post
    I think you meant to say 'diodes'.

    Voltage Regulator problem - Renault Laguna 2001 V6-stud-diodes.jpg

    Diodes

    Voltage Regulator problem - Renault Laguna 2001 V6-triode-valve.jpg

    Triodes

    Sometimes the correct naming of an item is necessary to convey your meaning.

  10. #10
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by 68 404 View Post
    I said something wrong? My understanding was that a modern alternator had the regulator fitted to the side. Sorry for trying to help Dave
    I'd say it was a joke. Triodes are special - very clever devices I reckon, as an aside.

    Keep posting!

    Cheers
    JohnW

    Renault 4CV 1950 (R1062)
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    Tadpole
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    Sorry for delay in replying... the voltage regulators appear to be failing relatively soon after I replace them. Originally, I discovered one day 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. Alternator wasn't charging 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.

    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 ($$$).

    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?

    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

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