Which front lights are you referring too. the top mounted YELLOW lights are DOT Safety lights and should only be under control of the 7-way connector on the rear of the truck. There should not be any 12VDC being provided by the trailer battery for any of the US DOT Safety lights. These lights will come ON when your truck lights are ON. They are required to be 'ON' when being towed at night so having a manual control switch would defeat this situation.
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I'm surprised to see a lower white light shown in this photo as I have had problems passing State DOT Inspections of having manual control lights on the rear of the trailer. I suspect having a manual operated light on the front of the trailer would raise the same red flag. ????
Roy Ken
