Welcome to the forum 
Sorry it has to be under these circumstances. If nothing 12V works then you need to start at the batteries. Follow the BLACK (positive) lead, from the battery and you might find an in-line fuse or circuit breaker.
Did you take a battery out or add a battery?
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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