If you have a DC amp clamp meter, put it on the wire from the break away switch. Pull the pin, you should see 12-15 amps. Under-you have a broken wire somewhere, over- you have a wire shorting out. This is a quick diagnosis method that has worked for me for years.
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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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