Any time the wire color and pin location is right and proper is a rare day.
If you have a test light, pen and paper start with the truck and hook the test light clip on the truck on a clean ground location.
With the ignition turned on, nothing else probe the plug for power this will be your auxillary or charge power terminal [if it is wired in on your truck]
Turn on your left signal, probe the plug and mark down where that terminal is, do the same for the right signal.
Next turn on the running lights, probe and write down.
Asuming you have an electronic brake controller, have somebody watch it while you probe the plug until the controller light comes on to indicate trailer is connected, this terminal is your brake wire.
Put truck in reverse if there is now power at a terminal that didn't have it before mark it down. [again may not be wired in on your truck]
Now you have one to three terminals left to identify if you only have one left it is the ground, if you have two or three left hook one end of your test light to the terminal you identified as running lights and turn them on, probe the remaining terminals with the other wire from the test light until your test light comes on, this is your ground and the other one or two that did nothing [auxillary power and reverse lights] may not be wired on your truck.
On to the trailer grab a 12 volt battery hook the ground to a clean spot on the trailer frame.
Hook the positive lead from the battery to a 20 amp inline fuse and use this to probe the wires from the trailer, the one that blows the fuse is the ground.
Replace the fuse and probe the remaining wires to identify right turn, left turn and running lights, the running lights will be the wire that lights up a bulb on both sides at the same time. the last wire will be your brakes, alternatley if your ears are good you can hear the humm from the brake magnets.
Draw a picture, stand on your head looking in a mirror or write little notes on pieces of masking tape to get all the wires where they belong and you should be good to test and go.
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