I don’t have an answer about the smaller wire, but wanted to comment on the other two. If you are sure of the black being negative and red positive, that is fine. But be aware that some RV batteries are the opposite. Some owners have reconnected them like a car battery and have blown fuses. My previous Crossroads was opposite, but my current Grand Design is Black negative and red positive.
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Steve & Sue
2017 Grand Design 297RSTS Travel Trailer
2017 Ford F-350 Lariat Crew Cab diesel 6.7 SW LB 11,500 lb GVWR package
Former: Crossroads ST26RB
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