So only one cable was connected to the battery from the 5th wheel? Did you have two 12v batteries in parallel or two 6v batteries in series?
If the black cables were not connected to anything I am assuming the batteries were not hooked up and working right? No power to the trailer?
Any chance you can upload a picture for us?
There should be a white cable and a black cable to connect a battery to your 5th wheel. The colors are not always consistent but one should attach to the frame nearby. That will be your ground and the other cable will attach to a breaker or fuse. That should be the positive connection. Any cables originally attaching one battery to the other battery won't be needed when installing a single battery.
Hope that all makes sense.
Cheers
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2014 Jayco Swift 281BHS, 300W Solar!
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
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