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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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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