We're not sure as the generator started working and the solenoid problem appeared. Trans West diagnosed the problem with the generator as a bad inverter board. I took the coach to cummins for a second opinion and the generator started working and solenoid problem appeared. After researching the Vansco multiplex,the #19 is a battery interconnect issue. We are now checking for a shorted chassis battery. I'm not sure both problems are related I may have separate issues, the fact that the generator started working and the other appeared makes me feel they are related.