Need more info. I looked up Catalina and got MH,TT, and 5th wheel.
I had a 1999 Coachman IKS, 36 ft. 5th wheel.
It had 12 volt from the front truck plug to the Marker lights and 12 volt B&W colored wires from the Converter to the OH lights and 120 volts to the receptacles. It also had RG59 TV cable run from a splitter in the entertainment center to the front TV point. One more circuit for the slideout. I no longer have the RV.
Marvin
2010 Coachman Freelander 22TB on a
2008 Sprinter/Freightliner chassis
1995 Geo Tracker (Toad)