We test for 12V going into the switch to verify it IS getting power. Then we test the other black wire coming out of the switch with the pin pulled. If you don't have 12V going OUT then the switch is bad. Don't try to repair, just replace it.
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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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