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Bad battery, Parasitic drain.

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Q: If you have a good alternator in your car why would it still lose power?
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How do you know when you need an alternator?

A new battery or one that tested good is in the vehicle and the car is still losing power. the alternator is what charges the battery while the vehicle is operating.


Battery has been replaced and alternator is good why does truck still loose power?

Try the cables from your battery and alt. Sometimes these can corrode.


Why would battery light remain on after replacing the wires alternator and regulator and the battery is good on your 1989 Taurus?

Sometimes an alternator with a weak diode(s)can test out fine, but can still trigger the light. I believe the problem is in your alternator. Good luck.


87 Monte Carlo alternator is good still wont charge battery?

If the alternator is good then the battery is bad.


How do you diagnose bad alternator?

Start the truck then disconnect the battery if it's still running the alternator is good


Why do the lights dim and voltage drop when slowing down or braking hard in 94 sentra bad alternator?

It may be the battery, if the car is running the alternator should still be good. The battery may not be holding charge and supplying your car with reserve power. I would take you car to the autoparts store and have them test the electrical system. They will do this for free and tell you if the alternator and or battery is bad.


Can an alternator be good but still not charge the battery?

Yes. an alternator can be good but you can still have charging problems if:- 1.Battery is no good. 2.Fan belt slack or worn. 3.Poor or broken wiring connections at alternator. 4.Loose or dirty battery conections. 5.poor or broken wiring between alternator and battery. 6.Alternator rating not large enough for application.


Will the altnator lock up causing car to stop?

It can happen. The bearings on the alternator of my Silverado did that once, and it ended up causing the vehicle to shut down. the alternator on your car charges the battery which in turn runs the electrical supply to the car. if your alternator is damaged the battery will deliver power to the eletrical system until it no longer can and the car will stop running.if i were you i would replace the alternator,recharge the battery if it is still good and then happy motoring.


How do you check alternator in 1990 silverado?

The easiest of all ways to check if your alternator is working is. Turn your car on and disconnect the negative battery cable. If your car dies your alternator is no good. But if it stays on. the alternator is generating power. its basically your cars power plant.


What is the effect of weak battery to the alternator?

The alternator doesn't care. It provides power no matter if the battery is good, weak, or not even there.


My alternator is not getting power from the battery The wiring from the battery to the solenoid and from the solenoid to the alternator is good is this a bad solenoid the car will start and run?

Check for a bad fusable link at alternator


Why would a Buick flicker the lights and click when trying to start it?

Not enough power to starter, jump it and then ensure alternator is good. Also check battery condition.