if you want there is s Robin’ diverters or you can use my version based on the oem’s tx shield and an uno ( preferable wemosD3) which also does multiple SSR dumps as well, but can also configure to handle multiple relay loads as well which in the summer for me it turns on my air conditioning, my electric utility car charging and now my recently added electric car ( a chevy volt - as I live pretty remote and there no infrastructure for pure electric cars out here)