I might differ a little in technique, but I think the important point is to never make the assumption that the last person to do the wiring knew/cared about what they were doing.
You'll save yourself hours of frustration if you take the time to go through each and every wire methodically, both on the truck side and the trailer side, and draw a detailed picture of the results, including pin location and wire color.
Store that picture in your truck and you'll thank yourself a few years down the road when you're doing something else with the wiring.
one other note - never assume the wire color on the trailer connector matches what comes out at the other end at the lights. Very common for that wiring harness to snap down below, and get rewired, sometimes very creatively - especially true if you bought the trailer used.
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