start the car, let it run for about 10 to 20 minutes then disconect the batery, the car should stay on (for a few minutes ofcourse) if it dies right away then the alternator is bad Other posts on other sites say this is NOT to be done or serious damage can occur. Do it at your peril.
the alternator belt could be slipping so check the belt, the wiring at the alternator could be faulty do a check with a multimeter. open the alternator and check the diodes .apply battery power and see if the rotor still spins inside the stator see current output
Check volatages everywhere, there could be a short somewhere. Also, check the tension on the belt that drives your alternator. That belt might be slipping due to a faulty tensioner and not spinning the alternator fast enough.
weak or faulty battery, faulty alternator (or slipping alternator belt causing battery not to charge) or faulty starter motor
It can, though it is unlikely -- the alternator and the voltage regulator would both have to be faulty. A faulty alternator will not charge a battery, though, so it may seem normal until the charge put into the battery at the store runs out.
Possible causes,- Faulty battery- Alternator belt missing or loose- Faulty Alternator- Alternator harness is open or shorted- Alternator circuit poor electrical connection
The alternator may have a faulty rectifier or faulty voltage regulator
A faulty alternator, a faulty belt tensioner.
Whining noises often come from the alternator or the steering pump. Check the power steering fluid in the pump (there is a dipstick on the pump), and have an AVR test done on the alternator. If the alternator is faulty, you are probably having battery problems as well. If the steering pump is low on fluid or is faulty, you probably are experiencing jerky steering from time to time.
Faulty Alternator?
As long as the battery is charged
A quick test I've always used is to start the car. Remove the neutral cable from the battery. If the car still runs your alternator is fine.
Yep, check those links. Or maybe someone sold you a faulty alternator. Did they check it before you bought it???