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Car Batteries?

My car battery doesn't seem to hold it's charge for after a few days of the car being stood still my car fails to start. Despite this when placed on a charger it only takes 20 miuntes to charge. Do I need to replace my battery or is there another fault in the car?

Moxy
March 2009
charge the battery up but dont connect it to the car leave it for a couple of days then put it on if it wont start it knakered or stop your car facing a wall put all your acceries on put your head lights on hight beam and lightly rev the engine you should notice a slight brightness when reving it not suspect the alt

ray
March 2009
First, how old is the car?
Is this the first time you've had to do this. If it is, go for it but, if it isn't, I would look into your alternator. During engine cranking, the battery is literally drained almost dry, so its up to the alternator the generate a charge to the battery through mechanical movement of the engine drive belts. This recharges your battery and, powers your accessories. A good way to test the efficiency of your alternator is to:

1. Start the car and let it warm up to proper operating temperature.
2. Turn on ALL of your car accessories(ACC.)...(A/C, rear window defroster, head laps, interior lamps...)
3. With All ACC. on, roll up your windows, assuming they are all ready in the up position.
4. If you notice a EXTREME surge of power loss as you do this( you will see a surge from your R.P.M meter... if possible), then it could be a possibility that your alternator isn't producing enough current to both, charge your car battery and, power your ACC. This isn't 100% reliable but, it is a test used by technicians to determine the charging power of the alternator.

Hope this helps.

P. Jones
March 2009

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