Two actions to try:
First, locate the remote control. Find the function "Lights" on the remote, turn it off. Then the switch should work. There is a "lockout" in the remote control "main box" that prevents the manual switches from operating any function when the "remote system" is active.... This prevents damage from a situation where the remote is being used and another person uses the manual switch. Both being pressed would "short out" the remote and damage the equipment.
Second, if the RV is used and you don't have the remote, remove all battery and shore power from the trailer. That means disconnect the batteries completely and unplug the shore power cord. Short out the battery cables (NOT THE BATTERY, BUT THE CABLES) by touching them together. That will dissipate any charge left in any of the wiring/components. Let the trailer sit in that condition for 10-15 minutes. then reconnect the batteries, plug in shore power and see if the manual switches will operate the light. If it does, great, if not, then the problem is likely not the remote system, but a wiring/switch problem and more troubleshooting is needed.
We have at least 4 or 5 times each year, the same question and almost always, once the member finds his remote and turns the "offender off", things work as they should.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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