The only way to completely disconnect the battery(s) is to either remove the positive feed from the battery to the trailer, or install a disconnect switch in that wire. There are a few different choices and they are all fairly simple to install. I prefer the Marinco brand and you can purchase them at most any RV or boat store and Amazon.
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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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