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Q:

after sitting the night it occationly will not turn over on 1998 Lexus GS400

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In the morning it occatinlly will not turn over
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If it seems to be okay after it starts and drives a while, you may have a parasitic draw on the system. This is something that remains on, even after the key is off. A sticking relay or even a module that is not powering down can discharge a battery and be intermittent. Also check the glove box, under hood and trunk lights as well as those in the vanity mirrors.