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Thread: Generator warning light

  1. #1
    Senior Member Phill's Avatar
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    Generator warning light

    I took my Nova out for a lengthy run on the Motorway this evening and had been sat at about 70 for some time when the generator warning light suddenly came on.

    Thinking that the fan belt may have broken I took the first opportunity to exit the motorway and examined the car to find the belt was intact but the generator had obviously failed. I drove the car back home with the warning light fully on. Once back I decided to try and re-polarise the generator and this seemed to work as the light now goes out again but I can detect a very faint (barely perceptible) glow from the light when the engine is running. I can't decide if this is normal or not as I had never noticed it before?

    More to the point - what could have happened to the generator? It has had new bushes fitted recently.
    "The most beautiful kit car in the world - Motor"

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  2. #2
    ***Euro-Nova Supporter*** BlueNova's Avatar
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    Electrics aren't my strong point Phill (I'm not looking forward to that part because I'll need to fully rewire the car eventually) but whilst you said the fan belt was still there ... I assume it's on sufficiently tight and not slipping?

  3. #3
    Senior Member Phill's Avatar
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    Quote Originally Posted by BlueNova View Post
    Electrics aren't my strong point Phill (I'm not looking forward to that part because I'll need to fully rewire the car eventually) but whilst you said the fan belt was still there ... I assume it's on sufficiently tight and not slipping?
    Definately not the belt slipping Alistair as the light was on the whole time I drove back. Starting and stopping the engine made no difference. It wasn't until I re-polarised it that it started working again. Don't know why it failed and why it should start working again. Also can't decide if a very faint (barely perceptible) glow from the warning light at all times is normal or not?
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    could you sate my curiosity and explain how you re-polarised the generator/dynamo?

    (edit)
    Am I right in assuming this is correct?
    http://www.dynamoregulatorconversion...g-a-dynamo.php
    Last edited by Gaisa; 04-07-2019 at 09:57 PM.

  5. #5
    Have you checked the regulator?
    You still running a dynamo? wow. Swap for an alternator, get more amps and less problems. Easy to do too.



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  6. #6
    Senior Member Phill's Avatar
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    Quote Originally Posted by Gaisa View Post
    could you sate my curiosity and explain how you re-polarised the generator/dynamo?

    (edit)
    Am I right in assuming this is correct?
    http://www.dynamoregulatorconversion...g-a-dynamo.php
    Hi Gaisa - yes that is correct. I found out about it from Alex when I first wired the car and couldn't get the generator to work.

    Peter - you're absolutely right - I really should fit an Alternator but for a weekend toy I'm loathe to keep on spending on parts when what I already have is still working. The voltage regulator is brand new - I bought it when I did the wiring. I'm hoping to coax a bit more life out of the generator but am now a bit reluctant to drive any distance in case it packs in altogether and leaves me stranded with a flat battery. Mind you - even with a faulty generator - I reckon the car should be good for a fair few miles before the battery goes flat assuming I'm not using headlights? And back to my earlier question - should the light go out completely or is a faint flicker normal?
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    ***Euro-Nova Supporter*** Spacenut's Avatar
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    Hi Phill - I have to admit I agree with Peter regarding the alternator, but I can also understand where you are coming from with the dynamo. Do you have an ammeter or voltmeter on the dash? If so, what were the readings when the charge light came on?

    Although I do recall my old HA Viva charge light glowing ever so slightly at night I would say that it is probably not the norm for this type of charging system, but using electromagnetic cut-outs to regulate the voltage there will probably be some leakage current somewhere...
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    Quote Originally Posted by Phill View Post
    Hi Gaisa - yes that is correct. I found out about it from Alex when I first wired the car and couldn't get the generator to work.
    Thanks for the information

  9. #9
    Senior Member Brett's Avatar
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    Quote Originally Posted by Phill View Post
    And back to my earlier question - should the light go out completely or is a faint flicker normal?
    If the system is working properly yes the light should go out completely.

    I would test the charging system by hooking up a voltmeter and testing the output voltage.
    Output voltage should be around 14.5 volts. Rev the engine to see if the voltage stays the same. It should stay around 14.5 volts no matter what the rpm's of the engine.

  10. #10
    Senior Member Phill's Avatar
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    I don't have an ammeter or volmeter to test the system - but I took the car out for a lengthy continous run today covering just over 60 miles but without straying too far from home just in case. Happy to report that the warning light stayed off and the car is running well with no real issues. And the battery seems to be fully charged when I got back. However, I still don't know what originally caused the warning light to come on though?
    "The most beautiful kit car in the world - Motor"

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