The most common cause that I see at work is a poor connection at the 7 way plug. Lightly sand the contacts of the vehicle side and gently spread the contacts to provide a tighter fit with the trailer end. The contacts in the vehicle side are a folded over design "v" and can be slightly spread apart. This procedure has repaired approx. 90% of the faults.
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2012 Palomino Ultralite T245
2004 F250 Supercab 5.4L
09 Grizzly 700 EPS
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