You should check the output from your transfer switch. On my Thor Vegas they bundled the wire connections with loose strands that caused a short wiping out the solenoid switch. Your transfer switch will be a box with heavy cables running in and out and functions to switch between generator and shore power. You can use a non-contact voltage tester to trace if any live wires come out from the switch. A short in the transfer switch would not trip any breakers or blow any fuses.
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