Your 7 way plug will have a 12V charge line. Reverse will be there but might not be hooked up.
E Trailer has diagrams showing both sides of the plug.
Depending on make/model of truck, charge line may only be live with engine running. Also some years of Chevy need the charge line hooked up.
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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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