Hugh,
There are other ways it can be done through an Automatic Generator Start system but the coach has to be configured with that system. Without an AGS in most cases the only way to start the generator is with the one or two switches installed (2 on my coach) or manually on the generator itself.
There are Onan and after market systems that can be installed. Attached is the info for an Onan system and you can also search for Magnum AGS if so desired.
f-1824.pdf
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