What happens if you disconnect shore power? How quickly is the flashing? You may be on the edge of the charger needing to charge and dropping down to a float charge and back to absorption or bulk charging if the flashing is not too fast.
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