A clicking sound suggests you are getting power to motorhome, but may be coming from various sources. Your inverter probably has a transfer switch also, so it "may" be the clicking sound. Best not to rule much in or out initially by assuming too much in my opinion.
Since MH is new to you, do you know if inverter came from Thor, or was it added by previous owner or dealer? Wiring could have been done differently making it more difficult to diagnose problem.
I would personally check to make sure you are not getting electricity at breaker power panel. But only if you feel comfortable with measuring 110 Volts. That's easy to do and will help narrow where problem may be.
P.S. -- Can you share more info? Are you at home or campground? Connected to 15, 20, 30, or 50 Amps? Using adaptors? Anything you share may help.
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