Question about 1999 Lexus ES 300

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I have a 1999 ES 300. The battery starts draining if I turn on lights or a/c. I have gone through 2 new batteries and 4 alternators. It's to the point when an electrical shop says we can run a diagnostic for $$$ I want to hit them.

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  • ruthwilmore Jul 11, 2009

    Because if I don't turn everything off and let the car charge for a while before I turn it off it won't start and I have to jump the battery. Also when I turn on the the lights or A/C all the lights in the car get dim. The reason it was felt the alternators were bad was because when tested while on the car the number (no clue what number that was) would drop below 12. Yes they were using a gauge - all 4 people that have worked on the car have used some kind of meter.

  • ruthwilmore Jul 11, 2009

    When I say turn everything off I mean everything that drains the battery like lights, A/C etc.

  • ruthwilmore Jul 11, 2009

    Also, in response to the posting about the amps - did all that 4 times.

  • ruthwilmore Jul 11, 2009

    Oh, and this is the correct amp alternator for the car. It was 80 for the first 10 years I owned the car. Why would it change now? Thanks anyway for your help Allan

  • Ned C Cook
    Ned C Cook May 11, 2010

    TELL ME WHY YOU thought the battery was draing? and why it was felt the alternaters were bad? Were you going by a gauge? What were the indicators you went by? I'll run a diagnostic for you for $$$$$$$$$$$$$$$$$. just kidding. Tell me what went on.



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Alternators come in different amperage rating. connect a good ammeter in series with battery positive terminal after engine is at idle. or connect a voltmeter on your battery. with engine at idle, turn on lights and a/c, raise idle at between 1500 to 1800 rpm. voltage reading should be 13-14 volts. if not, alternator is too small. check the amperage rating of your original alternator. good luck

Posted on Jul 11, 2009


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