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Thread: Corsa C Red Battery Light

  1. #1
    'GSi' Member
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    Corsa C Red Battery Light

    Trust this to happen a week before Trax...

    Basically I'm driving along and sometimes the red battery light comes on and off for a couple seconds at a time. Other times I have to lower the RPM from keys say 3k all the way down to idle before it goes off again. Then put it back into gear and after a while it'll come back on again.

    Must also mention that my auxiliary belt squeaks at low RPM when in gear pulling away.

    Could this be a faulty alternator? Or the belt might be loose so it thinks it's not charging the battery?

    I'm not having any electrical power issues, all works fine, HID's don't flicker or anything. Everything works as it should but the light keeps coming on and off
    [CENTER]Understeer: when you hit the wall with the front of the car.
    Oversteer: when you hit the wall with the back of the car.
    Horsepower: how fast you hit the wall.
    Torque: how far you take the wall with you.[/CENTER]

  2. #2
    'VXR' Member Taurus's Avatar
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    I'd try tightening the belt first, if it's slipping the alternator might not be driven sufficient to charge the battery. If that doesn't do it then it's probably the alternator itself. Measure the voltage at the battery with the engine running, it ought to be about 14v.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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    'GSi' Member
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    Done a test on the battery came out as 13.71v whilst the engine was running.
    [CENTER]Understeer: when you hit the wall with the front of the car.
    Oversteer: when you hit the wall with the back of the car.
    Horsepower: how fast you hit the wall.
    Torque: how far you take the wall with you.[/CENTER]

  4. #4
    'VXR' Member Taurus's Avatar
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    That looks OKish, but if the belt is loose it might be slipping under load. As said, tighten the belt first of all, or try some talc on it as a temporary measure.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

  5. #5
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    Will give it a try, belt looks tight as it is because of the compressor.

    Thanks Taurus
    [CENTER]Understeer: when you hit the wall with the front of the car.
    Oversteer: when you hit the wall with the back of the car.
    Horsepower: how fast you hit the wall.
    Torque: how far you take the wall with you.[/CENTER]

  6. #6
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    All of the symptoms that you have stated, point to the belt (and possibly the pullies) being worn, rather than an alternator problem.
    Even if it is tight, a worn belt/pulley combination can still slip under load.

    Regards.

  7. #7
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    Hopefully I'll be getting a new belt this week before Trax

    Cheers guys.
    [CENTER]Understeer: when you hit the wall with the front of the car.
    Oversteer: when you hit the wall with the back of the car.
    Horsepower: how fast you hit the wall.
    Torque: how far you take the wall with you.[/CENTER]

  8. #8
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    Finally fitted the belt yesterday, no change to the light at all. So I'm guessing the alternator is fxcked

    Light only comes on periodically, so not a massive problem as the battery is fine and is holding loads of charge. I'll just have to ease off the music and night driving for a while until I can get this problem sorted.
    [CENTER]Understeer: when you hit the wall with the front of the car.
    Oversteer: when you hit the wall with the back of the car.
    Horsepower: how fast you hit the wall.
    Torque: how far you take the wall with you.[/CENTER]

  9. #9
    'VXR' Member Aaron's Avatar
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    I got a petrol alt for 20quid off eBay. I give the working but noisey one away to be weighed in :/

    It was a bit of a **** to do and my mate sorted it for me. He has the skills and tools. But twenty quid to replace alt is a good price, see what you can do it for. You'll want it in winter.

    Is it true the alternator actually doesn't charge the battery but just replaces charge used from starting?

  10. #10
    'VXR' Member Taurus's Avatar
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    Quote Originally Posted by Shaggy View Post

    Is it true the alternator actually doesn't charge the battery but just replaces charge used from starting?
    Yes - and no - if you want to be fussy about semantics.

    The old dynamo systems would charge a flat battery, so if your battery was flat and you jump started it then drove 50 miles the battery would be fully charged.

    An alternator works differently. If your battery is flat and you jump start it you can drive 200 miles, stop the car, and then find the battery is still flat.

    An alternator does charge the battery, but it won't fully charge a flat battery back to full. Work on the rule of thumb that an alternator tops the battery back up to where it was before you started the engine. It will keep a healthy battery charged enough so you don't need to trickle charge it - eg my Vectra battery lasted 12 years without every needing anything doing to it. But if you've flattened a battery then you need to trickle charge it to bring it up to full charge again.

    Hope that makes sense.

    20 for a good alternator is a bargain.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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  12. #11
    'VXR' Member Aaron's Avatar
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    I didn't do that when nine went flat. It was wired up to a batt charger for twenty mins then ran the car for 30.

    It's been ok for weeks now. Maybe I'll get it fully charged in case
    Last edited by Aaron; 30-09-2013 at 10:07 AM.

  13. #12
    'VXR' Member Taurus's Avatar
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    It'll have enough charge in it to fire the engine - but if you were to measure the electrolyte in it I'd bet it's not at full charge.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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    Aaron (30-09-2013),Michael (30-09-2013)

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