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Do you have a 12 VDC test light or small digital multimeter for some testing? That will be the fastest way to track this down.
And are you plugged into shore power or not?
Most come from the Battery Control Center which is usually in a service bay or under the hood. I suspect that a shortstop breaker has tripped. Those can be either a manual reset or auto reset version. I am attaching a link to a photo of one that is a manual reset version. That black button has to be pushed in so it will reset. http://www.surplus-electronics-sales.com/images/medium/122-1012%20Short%20Stop%2028V%2030A%20CB%20sm_MED.jpg
Just checking back in to see if perhaps you missed my earlier response to your question or if not, do you still need some additional input from me here?