How To Test 7 Way Trailer RV electrical Plug

How To Test 7 Way Trailer RV electrical Plug

In this video I show how to test a 7 way trailer plug wiring harness for towing a travel trailer or RV by using a led trailer light adapter tester to test signals, brakes and running lights on the rear hitch of a tow vehicle.
Hi There, Check that you do have a brake controller installed and working on the vehicle it could also be a brake in the line or short somewhere (they are not fun to locate) BK - means Output from brake controller... Hope this helps! Cheers,

12V = 12 volt hot lead
BK = output from brake controller (if no brake controller is installed, this light will not light up)
BU = reverse lights (if this circuit is not connected on the vehicle it will not light up)
RT = Right Turn
TM = running lights (tail/marker lights)
LT = left turn

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