no brake lights when tail lights are on

gonefishing7903

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Joined
Feb 3, 2013
Location
Overbrook, Ok, USA
#1
ok i used to be a whiz a trailer lights but im running out of ideas. the brake lights and turn signals work when the tail lights are off but when they are on and the brakes are applied it all goes dark on the trailer. if anyone has any suggestions of what i need to check next i would appreciate it