Question about Toyota Previa

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Hi we charged the battery you fully & changed the alternater but it will start the battery light will go out but wont charge the battery when started like it is been drained but its not charging of the car. can someone tell a solution to this problem thanks.

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Is your serpentine belt in good condition? If not, replace it. You'll need a volt meter to check out how much the alternator is charging. Attach it to the negative & positive terminals of the battery & start car. It should read 13.2 to 14.6 volts. If it does not, you have either grounded a positive wire somewhere or your new alternator is not working. Have it tested at the automotive shop you bought it at. Good luck, I hope this helps!

Posted on Sep 05, 2010

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Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
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