Re: When to hire a pro...
A very basic invertor will have wires connected to the 12v DC system and others run to the 110v AC receptacles. More sophisticated systems also have wires connected to shore power, as they double as battery chargers. In order to test them with a multi meter, you need to know which are which. Some should show voltage, even if the invertor is bad.
Invertors do go bad, but its tough to know if its hooked up properly, turned on properly or blew a fuse. The cost of an electrician could be a good education in how your boat is set up. Meet him/her there.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.