I had a similiar issue in the fifth wheel until I found loose connections in the AC breakers. Two neutral, 2 hot and 3 grounds were very loose. Tightened them up super tight and the problem has not recurred since.
Now I check them every spring.
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2020 Coachmen Leprechaun 270QB (COA Member)
Jeep Wrangler toad for the dirt
"Well done is better than well said"....Ben Franklin
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