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I would recommend you start out a making certain all the battery connections, both positive and negative are good, clean and tight at the battery and at the opposite end of the cables. Be especially diligent on the frame ground connection as this can be the weak link. The next thing would be the connections of the ECM. Pull apart and look for any sign of corrosion of loose pins. Let us know what you find and we'll try to help.
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