Question about 2000 Lexus ES 300

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Interior and Exterior lights pulsing Dead Short Possibility?

I have a 2000 Lexus ES300. I have replaced both the Battery and the Alternator. Testing the battery with no load it reads 12.33v
With the Alternator running I tested the votage at the Battery and it reads between 13.77v and 13.89v. I never have a problem starting the car as the battery is being sufficiently recharged. The car will drive perfectly for 100 miles or more and then it begins acting up ie. All dash, interior lights and headlights will pulse on and off in a rhythmic fashion, becoming stronger until the idiot lights on the dash come on along with the Battery light and it tries to shut the engine down. It has done this on several occassions. When the lights are pulsing the transmission shifts very hard and erratic and the engine seems to miss a little. No codes show up for the transmission when I last had it checked. It seems to me to be some type of internal short. Is there any inexpensive way to locate this problem?

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  • Anonymous May 11, 2009

    I have same problem on a 1999 Camry with only 65k miles on it.
    Replaced battery and a 500 dollar alternator.Every light flickers
    and is a real annoyance.

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