Hmm that's strange! So when you click the headlight knob once do your running lights turn on like normal? One click = running lights + cluster lights correct?
Your running lights/corner marker lights aren't on all the time are they? Then I would think that your switch is shorted out. But if your cluster lights are on but your corner markers aren't then it's something else. That's a newer model truck that I'm not that familiar with sorry.
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