My brake lights and turn signals work .the strange part is that I just had a brake line go on my truck I replaced it but still the same no running lights when I turn the head lights on no camper tail ...
My 7 pin pigtail brass contacts had oxidation that was preventing a solid connection. After cleaning and applying di-electric grease the connections worked better. On my recent trip, my son was following me and reported I had no right brake light/turn signal. After disconnecting and reconnecting the 7 pin pigtail, the light began to work.
Check for corroded oxidized brass components in your pigtail connections.