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  LiveWire / Technical Forums / Cars, Trucks & Vehicles / Adding Reply

Adding Reply
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Topic Alternator Problems
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Original Post
medjai Posted at 6:12 pm on Sep. 29, 2008
Alright so the alternator is bad (its eaten two batteries already).

Why does the car die when I come to a stop light? Can I prevent it from dying by throwing it into neutral and maintaining a higher than idle rev? The car restarts after it dies no problem by the way.

Replies
KRNsoccerplayer24 Posted at 8:46 pm on Oct. 7, 2008
Quote: from medjai at 6:12 pm on Sep. 29, 2008

Alright so the alternator is bad (its eaten two batteries already).

Why does the car die when I come to a stop light? Can I prevent it from dying by throwing it into neutral and maintaining a higher than idle rev? The car restarts after it dies no problem by the way.


How long has it done that? I had alternator problems and i believe my car started back up fine a few times( i think i got a jump once), but then i noticed my radio messing up and i tested my wipers and they were going VERY slow so i pulled over and finally it just died, so i had to get a new alternator.

AtomicCactus Posted at 3:39 am on Oct. 6, 2008
Quote: from medjai at 6:20 pm on Sep. 29, 2008

Ok but can the car still run if it's already running when the batteries completely dead...
That's the premise of leaving a car running while giving a boost...
Neodymie Posted at 1:47 pm on Oct. 1, 2008
No that wont work. Charges equalize. There will be no force to push it into the other battery so they just even out.

Are you positive it's the alternator? Try charging your battery completely then unhook the alternator. Try driving it around a little bit and wee what happens.

medjai Posted at 9:14 pm on Sep. 29, 2008
Sounds good.
ScoobyDoo82 Posted at 7:22 pm on Sep. 29, 2008
Im not totally sure but I would think it would change the battery, if you just let it idle. But make sure you dont kill the battery in the truck doing that.
medjai Posted at 7:02 pm on Sep. 29, 2008
Btw I don't have the option of throwing an alternator on or I would.
medjai Posted at 7:02 pm on Sep. 29, 2008
New question.

If I connect the battery in the jetta to the battery in my truck so as to jumpstart it, but instead of jumpstarting it, just let it sit there for a long period of time can I fully charge the battery?

ScoobyDoo82 Posted at 6:47 pm on Sep. 29, 2008
If the alternator is no good, no matter how much you rev you aren't going to produce a charge, just get a new one, thats the only way to solve your problem.

Also, shut everything off to conserve whats left of the battery (heat, a/c, radio, wipers, DRLs <(if possible)).

medjai Posted at 6:20 pm on Sep. 29, 2008
Ok but can the car still run if it's already running when the batteries completely dead, as in if I keep it revved for the entire trip (even at stops)?
rijames99 Posted at 6:19 pm on Sep. 29, 2008
IF it's your alternator, you will be able to restart it only as long as the battery lasts, which won't be long.  You're using the juice in the battery to restart it while not recharging the battery.  get a new alternator.
Also, it may be stalling becausse of an ignititon problem, but if you know you're alternator is bad, start with that.
stl man Posted at 6:19 pm on Sep. 29, 2008
Quote: from medjai at 9:17 pm on Sep. 29, 2008

It's a VW Jetta and it's my brother's car, so I'm not going to buy an alternator for it lol.
that's what u need to do. either that, or get a car battery charger
medjai Posted at 6:17 pm on Sep. 29, 2008
It's a VW Jetta and it's my brother's car, so I'm not going to buy an alternator for it lol.
2kewl4u2know Posted at 6:15 pm on Sep. 29, 2008
My boyfriend's car used to do that too sometimes.  So, when it was really bad what he'd do is super slowly roll up to the stop, that way he could hopefully avoid stopping completely.  He eventually got new spark plugs or whatever and it's not as bad...although it's still a little shaky on speeds under 30.
Killer Tofu Posted at 6:14 pm on Sep. 29, 2008
get a new alternator..
Raven Sword Posted at 6:13 pm on Sep. 29, 2008
what kind of car is it
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