Food for thought - we had an intermittent problem where the lid would sometimes open and then maybe the fan would start or not.
It turned out to be a loose connection under the inside cover where the spade ended power wire attaches to the top of the replaceable barrel fuse holder. All fixed from the inside by removing crank then cover then simply crimping the female blade portion of the connector and reinstalling. Seems the loose connection would sometimes run the lid and then arc out when the motor tried to kick in.
Has worked since.
1999 Newmar Mountain Aire MADP 4080, Cummins ISC 8.3L, Allison, Spartan MM IFS, Howard Power Center, Chev Trailblazer LTZ Towed w/ BlueOx rigging, Segway X2.