RV brakelights

Driving home in big rainstorm. Pulling toad. Stopped for fuel and noticed brake lights on on motorhome with motor off. Unplugged toad, brake lights off. Plug in, brake lights go on. Discovered toad 6 pin plug all corroded. Replaced. Plug toad in brake lights on RV come on. Took toad to service that installed tow bar and electrical. All good. Replaced tow cord. Brake lights still come on. Bought LED 7 blade tester for RV plug. Everything testing as it should…..
Help
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2022 Nexus Wraith 34w
2016 Jeep Wrangler