I have had similar problems a couple of times with two Ford F350s, and in each instance it was a wiring problem within the truck, not the RV. In each instance, bad connections were shorting out, but sporadically. When tested stationary, tested good, but with movement would fail.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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