Look in the right rear and front left compartments for the fuse blocks. You have two sets of fuses for the brake lights and turn signals etc. One is for the coach itself and the other is for the 7 wire receptacle. You may also have a converter in-line if you have amber turn signal lights. Check the converter for power in but not out. If so, the converter is bad and will have to be replaced. Good luck and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7