Doesn't happen all the time only after it sits overnight or a long period of time during the day.
Turn the key and will not crank over... Doesn't happen all the time. on 2003 Chevrolet Express 2500
AGREE WITH #1 SEEK DIAG AS NOT TO WASTE MONEY
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This could be as simple as a bad connection or a starter you need to check power to the starter terminal while no start is occuring and ignition is in the crank position if there is power its a bad starter if there is no power it could be a neutral safety switch or ignition switch