One way to reset the remote, all the lights and the logic circuit (inside the remote brain) that controls whether the light switch will work to manually turn the lights off and on, is to remove power from the remote control brain. To do that, unplug the trailer from shore power, disconnect the battery and short the positive and negative battery cables together. DO NOT SHORT THE BATTERY !!!!! When you disconnect the shore power and the battery power, the battery cables will have no energy to them, so shorting them together will only 'drain any electrical potential" that may be remaining in the system.
Once you do that, reconnect the battery and try to turn the docking lights off with the manual switch located on the front of your trailer. It should work.
Cougar has changed remote control units several times between my 2014 and your 2018, so I have no idea which model remote you might have installed. Resetting it, however, remains the same: No power and the system reverts to "base settings".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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