Suspecting the ground wire between the truck and coach is not making constant good contact. This is the only thing that I can think of that would cause issues with all driving light circuits on your coach becoming intermittent. Maybe others can chime in with other suggestions as well.
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Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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