It all depends on what model you have & how it is wired. In my Montana HC 305RL, One of those is the cable/satellite "In" from the convenience center, the other goes to the TV hookup in the basement. You put the jumper in place to route cable/satellite to the TV in the basement. Yours may or may not be the same. There is no standard in any of these units & each one is different.
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2017 F350 CC LB SRW 6.7
2015 Montana HC 305RL
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