Question about 2000 Toyota Camry

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Battery does not keep charge it is new and the alt is fine. 2nd battery in a yr. Terminals are fine.

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Does the battery have a sort of fuzzy stuff ( verdigrease ), if so, then it is just a bad connection, ...remove the contacts and clean them,and the battery posts with heavy grit paper

Posted on Jul 26, 2009

  • jim galbraith
    jim galbraith Jul 27, 2009

    a little tip, if this was your problem, then after you have cleaned the battery posts and put the terminals back on...smear then posts and terminals with grease, or vaseline......this should prevent the problem in future..........

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Well, if you say the battery and alternator is fine, then obviously there is a draw somewhere killing the battery. You need to install a meter between the battery and terminal. remove each fuse at a time and see any drops in voltage. Make sure trunk light is not staying on when closed. Make sure glove box light not staying on.

Posted on Jul 26, 2009

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BATTERY CABLES CAN LOOK GOOD.BUT WHEN THEY WEAR.THEY CAUSE A HIGH RESISTANCE IN CHARGING CIRCUIT.THAT LEADS TO PREMATURE BATTERY FAILURE.

Posted on Jul 26, 2009

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2 Answers

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If the battery/charging system light was tripped by the computer, it will take a obd2 scanner to turn it off.Keep in mind that the light indicates a problem with the charging system and not the battery in specific.
A volt meter place on the positive and neg battery terminals with engine running will give you the output reading for the alternator. The charging voltage should be between 13.6 to 14.2 volts. Keep this in mind, the lower the voltage, the higher the amperage going into the battery. So, if the charge rate is 15 Volts, There are o amps and the voltage without the amps Will fry the battery and the excess voltage can damage other accessories as we as lighting.Good Luck. If need arises I'm here. Ned

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First tell me why you don't think it's charging.
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.
Hope to hear from you and good luck.

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2 Answers

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Check the alternator is charging.
Check dash indicator 'BAT' lamp lights when Ignition on prior to starting motor,
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Rest at ease the 14 volts will not hurt your system idealy your alt will charge at around 14 to 14,5 volts at the alternator and probably have a slightly lower charge rate at your battery at around 14 to 13.5 at the battery this is completely normal

Jan 22, 2009 | 1997 Dodge Caravan

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