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Thread: Alternator Not Charging

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    Vehicle : Signum

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    Engine : 3.0 diesel

    Year : 2006

    Default Alternator Not Charging

    Hi All, I am after some ideas. The alternator on my Signum 3.0 V6 CDTI isn't charging. It has been replaced, the garage tells me there is no difference with the new one, so it is very likely something else causing it.

    Anyone have any ideas? Thanks in advance

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    Regular Member northpole's Avatar
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    Engine : 2.0 16v DTI

    Year : 2003

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    It's a garage they need to do some diagnostics... let me say it this way if i was to bring my car into a garage and they wrongly diagnose this resulting in me changing the alternator, just for them to tell me it's not that i would loose my ****... 9 out of 10 times it means the auxiliary belt tensioner needs replacing( plus the belt itself) and if the can't find that out by themselves that is one bad garage... i'm not even a mechanic and know that this is one of the problems with the belt tensioners on most cars... it is the first thing they should've looked at anyway plus they should've tested the output of the alternator before replacing it...

    I would say find another garage...

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    VIP-Member Jon1796's Avatar
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    Plug a diagnostic’s in and look on engine to see if canbus is reading anything. Also check continuity of cables to from alternator to battery.

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    Regular Member Vwdub2000's Avatar
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    Vehicle : Vectra c estate

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    Check the basics the wiring, ground wire, positive wire use multimeter, clean up and check contacts that run back forth between alternator and the battery. It's older car add British weather more issues. That is where I would start.

    Sent from my SM-N960F using Tapatalk

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    Ok, thanks for the replies. It was the AA who diagnosed the alternator as faulty, not the garage. They have put a new alternator on, and it hasn't fixed the problem, they don't think it is the tensioner (the tell me there is no play in it and the belt is fine, that is only about six months old anyway).

    They are waiting on their auto electrician to have a look at it, I just thought I would see if anyone had any ideas/experience on it here.

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    Regular Member northpole's Avatar
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    Mileage : 140000

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    Will be wiring to and from the alternator that causes the problem than... like I said some simple checking and a multimeter would do the trick...

    They don't need an electrical guru for that.

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    Forum Moderator soulman's Avatar
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    Having similar problems with my 1.9cdti Astra twin Top . Battery keeps losing charge if left for 3 days .Now the heating has packed up , no blowers . Temp gauge showed minus 32.6 ,now just F .

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    Quote Originally Posted by soulman View Post
    Having similar problems with my 1.9cdti Astra twin Top . Battery keeps losing charge if left for 3 days .Now the heating has packed up , no blowers . Temp gauge showed minus 32.6 ,now just F .

    on that I’d check uec and bcm. From what I’ve read damp or corrosion on pins on back of uec, or failure of bcm.
    silver kept draining the battery since I got her then when I added rain sensor to blacky and turned on comfort close blacky had same thing so turned off on both now fine.

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    This is, finally, sorted out. Turns out it was the ECU not telling the alternator to operate, apparently because damp got into it. The ECU has been repaired and all appears fine now.
    Last edited by daveystoat; 13th January 2021 at 16:21.

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    Regular Member Vwdub2000's Avatar
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    Quote Originally Posted by daveystoat View Post
    This is, finally, sorted out. Turns out it was the ECU not telling the alternator to operate, apparently because damp got into it. The ECU has been repaired and all appears fine now.
    That's great, happy you got it sorted. Good diagnostic is key.

    Sent from my SM-N960F using Tapatalk

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