Question about 1999 Lexus ES 300

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My car has failed to start several times. At first, after getting a jump start and driving a while, it was OK. I had not used the car for a couple of weeks. I assume I need a new battery, but could it be the alternator?

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It could be either if you have a gauge on the instrument panel you can see if it is charging or not. It should be reading between13-14 volts. Most auto parts places will check this for free.

Posted on Jul 30, 2010


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You have the battery and the alternator and the alternator belt and if they are working fine there must be something that is draining the battery. You need an auto electrician to check what the drain is. In such cases,on various vehicles, the BCM, body control module, proves to have something to do with it. Get A GOOD AUTO ELECTRICIAN to check if there is a particular component
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3-yr old battery went dead in my 2002 chevy S10 pickup

Yes, it sounds like your alternator is short circuited internally. Replace alternator with high quality rebuilt unit
how does the alternater works
Alternator and Charging System A battery is needed to power the operating system of your car. Once the vehicle is running the battery is charged by the alternator which is driven by the engine. While in operation the alternator creates electricity, about 13.6 to 14.3 volts, and recharges the battery to its original state of charge. The alternator is one of the hardest working electrical components in your vehicle. When your vehicle is running the alternator is busy creating electricity to provide the engine and the car accessories with needed power. When the car is not running and your battery is severely discharged some electrical components may still operate or operate poorly. Typically, these components are designed to operate properly at 12 volts; if the system voltage is low it can cause erratic symptoms.
to check out how the alternater looks .
When jump started a severely discharged battery can cause the alternator to overload and internally fail. If this occurs replace the battery before replacing the alternator. This will help prevent a second alternator failure. Most vehicles use a multi-ribbed belt connected to the engine to rotate the armature inside the alternator. If the belt fails it should be replaced immediately. Belt tension should be taught. If it isn't, check the belt tensioner. It may need to be replaced or the incorrect size belt may have been installed. Either of these conditions can cause the vehicle to stall and not restart.
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Mar 27, 2009 | 2002 Chevrolet S-10

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Rpm will rev up then come back down on start up several times then seems to be ok untill next day start up stalled out on me going in reverse to drive a couple times also

you didnt give much info about the type of vehicle but it could be showing signs of build up in the throttle body which can be cleaned with a little gas on a rag while holding the butterfly open. Or possibly the idle air control motor beginning to fail .

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I cant start my escort van. it has been on the drive for over 12 months. i've tried to jump it but no good. the same thing happened a couple years ago but managed to jump start it that time

if went you start jump engine turns over, check for spark at spark plug wire if o.k check fuel pump persure if no persure check fuse and relay, if ok check voltage at fuel pump if ok replace fuel pump.

Nov 04, 2009 | 1997 Ford Escort

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