You're going to have to do some "investigating" to determine which lug in that junction box go to each of the trailer functions. The easiest way is to drag out a 12 volt battery. You can use the one on your trailer tongue, and connect the battery negative terminal to ground, then using a wire (or test lead) connected to the positive battery terminal, touch each of those lugs in the junction box. BE CAREFUL TO IDENTIFY AND NOT TOUCH THE NEGATIVE LUG). Have someone helping you from behind the trailer and as the brake lights light, mark that lug, then left turn signal, right turn signal, clearance lights. Then all that's left is brakes and charge line. The center is reverse/back-up lights and is typically not used on Keystone products.
Then, with your "identified lug functions" connect the wires from the 7 pin umbilical cable based on this diagram.... The color code in the bottom drawing should be the same as your disconnected trailer umbilical cable. So start with the color wires for each function and attach to the lug that works on that specific function.
Once you have that done, test and adjust as necessary, however NEVER change out the tow vehicle wiring to match the trailer. If you do, then it will not work with any other trailers, so wire your trailer to match the tow vehicle !!!
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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