I’m not going to much more help than what you’ve gotten so far. We don’t sell/service units with the in command system so I’m not that familiar with specific schematics.
What Chuck has said is on track, and I too don’t believe you need a separate switch.
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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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