Question about 1995 Lexus Sc 400

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When i turn headlights on engine dies on 95 lexus sc400

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  • lexluthersc4 Jul 05, 2010

    the battery seems fine, I tries jumping it & it would not start. sounds like ignition turn over but engine wont fire up. next day I tried again, and it started but as soon as i turned on headlights on it killed the engine...

  • Herb Bullis Dec 31, 2012

    I had the same thing on a Buick. The battery cable to the starter was loose. If I turned on lights or A/C high speed fan it would die.

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  • Lexus Master
  • 6,826 Answers

Is the battery fully charged?

The alternator may be bad. If the headlights reduce the voltage to the computer and ignition system, the car will stall.

I would check this first.

Good luck on this one.

Posted on Jul 05, 2010

  • 2 more comments 
  • Duane Wong
    Duane Wong Jul 05, 2010

    I would have the battery and starting and charging system checked at Sears or Walmart or an auto parts store.



    Otherwise, the battery's condition may not be known to be good or bad ( a bad cell in a battery will show up on the tester, assuming the battery is charged as fully as it can first).

  • jikzer6 Jan 21, 2011

    Can someone help me. I'm having the same problem like this guy. When you turn on the headlights while the car is running, it will die. And if you keep the headlight switch to on the car will not start. Please Help.

  • Duane Wong
    Duane Wong Jan 21, 2011

    I would test the battery and alternator while in the car to make sure it's charging. Headlights on should never kill the engine unless the battery is really low as a result of not charging sufficiently with a known 'good' alternator as tested by an electronic load tester.

  • Herb Bullis Dec 31, 2012

    I had the same thing on a Buick. The battery cable at the starter was loose. If I turned on lights or A/C high speed fan it would die.

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