Question about 2003 Volkswagen Jetta TDI

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Car won't keep charge

My car will boost but it will not hold it charge. I think it is the alternator but the service manual doesn't tell me where it is located. Is it easy to change and where is located?

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  • justin barath May 11, 2010

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  • 17 Answers

Yeah it might be the alternator but how old is the battery??

Posted on Feb 16, 2010

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1 Answer

99tl Acura is there any other reason battery won't charge if alternator is good


the battery is no longer good and can no longer hold its charge, example, u need to boost ur car in the morning but then ur fine through out the day, car sits over night thus loosing its charge and needs to be boosted again

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The car was running fine one day then the next day it would not start. We tried jumping it thinking the battery might be dead and it still would niot start. The car has power until we take the jumper...


Sounds like you have a toasted battery or alternator. Have you performed a load test on the battery? Have you tried to charge the battery? First remove the battery and charge it externally from the vehicle. If the battery won't hold a charge, or won't hold a charge of 12 volts, replace it. Once you have the vehicle started, test the operation of the alternator. It should be putting out at least 13 volts back to the battery to keep it charged - if it is putting less than 13 volts or more than 16 volts, replace the alternator.

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My 1997 Odessey rarely starts without a boost. I know it's not the battery. Because I trickle-charged it overnight. It was fully charged in the morning.


Check the battery cables, both ends for corrosion. clean or replace. The corrosion will travel up in the rubber coating of the wire. So if it looks like it is (usually will start to swell up) replace the cable. This is one reason for your problem. the other is the starter is just pulling to many amps. it needs replaced.

Sep 01, 2011 | 1997 Honda Odyssey

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Just shut off the care returned 2 hours later no go got a boost went for a drive left the car running for awhile than it start to get like it was going to stall went on g=for a littlwe while than died....


Hi your problem sounds like the battery is gone and won`t take a charge. When your engine is running the alternator is supplying the electrical power to run the car ( and normally charging the
battery as well )
Even though it seems strange for the battery to go suddenly, it does happen.
How old is the bat. Most last about 5 years with normal driving ( batterys last longer if the car is used every day )
Anyway i hope i have been of some help to you.
John (south Wales UK )

Jul 05, 2011 | 1995 Honda Civic

1 Answer

Saturn 98 wont hold charge, batterie light turn on and than car stop running... is it the alternator or the wireing


Alternator is your likely problem. The wiring isn't bad in saturns, just need to replace the belts when needed. Your problem though is definitely that it just doesn't keep a charge, so your alternator is responsible for your dilemma.

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Have a 1991 or 1995 Intrepid and car died, tried to boost the car gave it power than died, we noticed corrosion on the posts so cleaned the posts. (Noticed lights and power was coming back on when...


did it stay running when connected to the car giving the boost? if so then the alternator is not charging the electrical system, get it serviced or replaced.

Feb 25, 2010 | 1996 Dodge Intrepid

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Car starts when boosted but wont start by itself after tuning it off. Is it the battery or alternator?


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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Was driving home it was 35 below had to boost car be for i left work drove 30 miles when the car just quit next day charged battey full charge but it will not stay charged is it the alternator or the...


It's a possible combination of both. A bad battery won't ever hold a charge and a drive of 30 miles should have charged the battery sufficiently to start the next day. Since the car would run once jumped, the alternator appears to be doing it's job but without having it tested (most auto parts chains will perform this test free of charge) it's impossible to tell whether it's putting out enough amperage to adequately to charge the battery.

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