Welcome to the forum. Much more information is needed to make any recommendations or even to draw conclusions. Things such as what year Montana, are the lights OEM or after-market, have they ever worked, is the wiring routed through the awning arm or are the lights mounted to the side of the trailer, have you checked the physical condition of the wires, are the connections at the LED fixture secure. Those are just a few of the "necessary tidbits" before anyone can make more than a WAG about what might be the problem....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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