Need to know what the other prong on the plug goes to. If it is the hot wire for the brakes, I would be all under the trailer checking the brake wires. Just wiggling wires near trailer tongue is not good enough. Also, if the arc marks are near the ends, you didn't get it plugged in far enough. If they are well back on the prong, then the female part is stretched and loose, needs replacing. Just a couple of first thoughts. Also nice to know what brake controller you have, and was the light flashing with rhythm or just on sometimes, off sometimes. Details, details, details. But they really do make a difference.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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