Question about Volkswagen Passat

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The car will take boost ,but wont hold charge, it has a new battery. had alternator, starter checked both r good

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Something in your electrical system is drawing the battery down. I have seen brake lights that stick on, under the hood lights, trunk lights and so forth stay on when the owner doesn't realize it and this draws the battery down. Check all your lights and switches for something that may be on and you didn't know it. Did anyone load test the battery to make sure it is good? Ive seen batteries from the factory that weren't any good. Since the battery is new, I assume you had this before you changed it but I needed to ask that anyway just to make sure. Listen for any fan that might stay on as well. I don't know of any real recall issues or such.. In the past there was an issue with brake lights shorting out and staying on, check the brake light builbs for dark burned spots, the other issue may be with the security device if your car is equiped with one. Well that should cover it for now, gte back with me if you don't find the draw and we can look for other issues, but I bet you find it, Good luck

Posted on Mar 15, 2011

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1999 Oldsmobile intrigue 3.5 LTR V6 Will Click Once, Wont Crank and Will Not Start.


I think probably not the starter, the battery is dying. The old alternator was possibly OK, but it never hurts to have a new one.

The behavior you describe is absolutely classic for a dying battery, which will not retain a charge. If you are sure for some reason that it is in fact OK, the only other answers are worn out contacts at the bottom of the solenoid, or a dead segment in the starter motor.

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If a good battery is losing charge overnight then it is probably being drained by something left on! The usual areas to look at would be the boot light or glovebox light, check these or anything that might be staying on when the ignition is turned off!

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alternator has nothing to do with a car starting. All it does is charges the battery. If the battery is good and charged then you most likely left a sensor unhooked or you did not disconnect the battery to replace the alternator and popped a fuse or possilby damaged a computer if a short occured.

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It could be either. The alternator feeds electrical charge to the battery. Easiest way to tell is spend the 100 bucks and replace the battery. Even if your alternator is good, some batteries will not hold a charge even when boosted.

If that doesn't work try to get a used or rebuilt alternator.
Personally I would take it to a shop and have them check it first. You could have a solenoid issue and your battery and alternator are fine.
There could aslo be an electrical short in the wiring harness that is causing a draw on your battery.

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All the alternator does is charge your battery. If the battery is good, like you say, and the battery cables and connections are clean and tight, then it probably is the starter. If it doesn't start with a boost either, then you know it's the starter. If it does start with a boost, then your battery is no good, and that could be because of a problem with your alternater. If you don't have an amp guage on your car, any garage will have one, and be able to test your alternator in a few seconds.

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dose it start when you get a boost off, and if it dose you need to check your battery connectors they may need replacing, and if thats not the problem make sure that your alternator is charging your battery and if non of these are the problem you need a starter.

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