If the shore power cord is unplugged do you have 12 vdc power in the coach? If not check the circuit breaker on the tongue of the trailer. If it is resettable, there will be a small button on one end that needs to be pushed in to reset.
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