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I need some help, my running lights go out when I have been driving for a while, I have a 2005 corvette, also if I leave the car on I’m fine if I cut the car off they do not come on nor does the icon on the dash.


Corvette1
 

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It would need to be diagnosed. Have you read the information section on DRL in the owners manual? Do you have access to a wiring diagram and service manual for the car?
Find out where the lamp voltage stops when they aren't working as everything will test OK if they are working.
Possibly a bad connection or something is failing in the ignition 'run circuit to the DRL? I am not very familiar with this era of GM electrical systems. Begin with a visual inspection. 'Wiggle' tests may reveal a poor connection.
 
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