A GFCI will not Test/Reset if it does not have power, re: wiring/ tripped breaker, or defective, so power down, pull receptacle and inspect/ replace. If it has power to wire/screw, it is bad GFCI. Many/most RV receptacles are quick install type, wires push in, and often problem is wire pulled out.
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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