You could pull the speakers and ID the wires. Should be stranded 2 conductor, one will be white and the other will be white with a colored stripe.
Then look for a panel that would be a logical place for a radio and look behind it. Sorry I don't have more but like John said there isn't any schematics.
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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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