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Try this.
In the first pic (outside connection) try connecting the coax to the middle connection. On my 2017, the label on the door says the middle one is for cable. However, they have been known to connect them wrong inside so you might have to try all three.
In the second pic, you should be connected to the TV output and make sure the amp (light) is off.
Then you have to go into the TV settings, set the channel scan to cable, and run the scan. If no channels are found, change the outside connection to another connection and try again.
HTH.
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2018 GMC Sierra 3500HD Denali 4WD LB SRW 6.6L Duramax
2017 Jayco Eagle 330RSTS
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Linear Mode
