For anyone having these problems with motors....take a look how tight the factory pulls the wires and straps them with clamps. Mine were so tight the rubber gasket was cracked,possibly allowing water inside . I loosened the clamp and made a nice smooth curve to the wire and re calked the gasket . This may have been the problem for everyone.
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 Chev Silverado 2500HD 4x4(only a 6.0 l gasser)