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How does it act with the trailer hooked to the hitch? If the symptoms disappear you probably have a bad connection at the plug. Speaking of plug...are you connecting to the factory plug in the bumper or an auxiliary plug set up for the 5'r? The truck's receptacle may be the problem. Using an ohmmeter do you get < 1 ohm from the ground pin to a good chassis ground?
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Bruce Johnson
Veritatem Suppeditare
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'02 Silver Bellied Atlantic Blue 2500 Laramie SLT +, QC, SWB, 5.9 CTD, Auto, 4x4, 3.54 Trac-Loc, Michelin LTX AT2's 265/75/16, KC DayLighters, Smittybilt chrome grill guard & nerf bars.
2010 Arctic Fox 25S
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