Question about 2002 Volkswagen Jetta TDI

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My 2002 Jetta 's battery keeps getting drained. Its a new battery. And it has a new alternator. When you shut the car off and remove the key, the radio still works and the odometer is still on. You can come back out a half hour later and the radio is still on.

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Check your belt to see if it is loose. If not, then you have something that is staying on. Like a wire touching or something. Hope this helps, James Booth









Posted on May 17, 2011

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Brand new battery on 1995 VW Jetta keeps being drained and car shuts off.


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If there is no charging from the alternator the "problem" will be solved as long as the new battery retaing its voltage. As soon as you start to use power you drain the battery. it's a bit like putting air into a punchured tyre ..... its still punchured . Could be your original problem ! ! Good luck

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I have 2002 jetta with 2.0 and I have problem with charging system .I by new aternator 90 A and still I dont Have full charge 14.0 V .i have 11.4 V . Wot I can do to corect the problem


If you test the terminal on the back of the alternator you should get a reading between 12 - 14V. If not, take it back. If you're testing on the battery there could be a draw in the system or a bad battery.

Jul 26, 2012 | 2002 Volkswagen Jetta TDI

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2001 Jetta TDI Battery drain??


If you suspect the alternator, disconnect the 12V line coming directly from the battery and check for current drain. Are you sure the current unit is in ampere (A) and not milliampere (mA)? A 5A current will drain your battery in about an hour. A 5mA current is just about normal considering the parasitic load (radio memory chip, clock, ECM memory circuit, etc.). Try checking your battery. It could be the real culprit.

Mar 16, 2017 | 2001 Volkswagen Jetta TDI

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Power draw on a 98 vw jetta gt


There are two problems which might be occurring besides the obvious battery terminals needing to odd wire brushing to expose pure silver lead at the conact posts and inside the post clamps. My 2002 Jetta actually had a crushed wiring harness - Good stuff but it may have been assembled somewhere other than Germany and someone banged the wiring just enough to short or create resistance in the crushed copper. This was solved by a new wiring harness under the hood which also involved the Diesel glow plugs burning up all the time. Second problem may be badly installed diodes in the Alternator. I heard that some have them installed backwards, but only one of them in the group, so of course that would play havock with your charging system even though it will have enough forward power to run your engine. Also the control plug-in wiring on the Alternator sometimes gets salt on it and corrosion then won't let the system be able to get currant to your Alternator to make any power. This is a cheap problem to fix, just buy a new $8 Alternator plug-in and solder it to your wiring cable with good heat shrink wrap insulating tubes and a hair dryer.

Dec 17, 2011 | Volkswagen Cars & Trucks

2 Answers

My car battery keeps getting drained. what is draining my battery.


Are you sure that you have a problem with something draining the battery, or do you have a problem with the alternator not charging the battery? I would have the alternator tested to make sure of that before spending hours and hours troubleshooting electrical problems.

Basically, to check a problem like this you will need a clamp on amp meter. Then you pull fuses from your fuse panel and see where the drain is. Make sure you have a good layout of your fuse panel and fuse sizes (a digital photo is also a good idea) before starting, so you don't introduce problems.

Jun 26, 2011 | 2000 Volkswagen Jetta TDI

1 Answer

My Jetta's battery died - my husband replaced the Alternator as well as the battery since the Alt was draining it - now if you disconnect the negative post at night, then re-attach in morning it will...


you better check the relays or replace them all and see whats happing
alternator will never ever drains battery it just could not be able to charge it but it never drain
what makes drain in battery cold be anything consume (not produce) power

Jun 18, 2011 | 2005 Volkswagen Jetta

1 Answer

The shut down problem for 2002 cavaliers address a chipped key re-learn. however my keys are not chipped, any other solution? my cav has all the symptoms of the anit theft shut down


When the car was new it did have a chipped key. I don't know why they start sometimes without them, Faulty security? Anyway you will have to get a chipped key from the dealer or a hardware store. then do the relearn procedure. The procedure is , turn the ignition on for ten minutes, turn it off for five seconds, do this three times and after the third time the car should start. Make sure to keep the battery charged up because this will drain the battery. If it drains below 5 volts , you will have to start over.

May 15, 2011 | 2001 Chevrolet Cavalier

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