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Why is my ODB port unresponsive?

2004 Silverado 4.3 v6, my ODB port is not receptive at all. I have plugged in a couple different fault code readers and I'm not getting power to the port. I need advice on trouble shooting where the issue is located? Or a good place to start.

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@nolabec the usual cause for that is a bad cigarette light fuse. Check to make sure that it is ok.

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