I found the fuse for the ceiling slide out lights, it was marked incorrectly as STEREO, tried replacing this fuse, immediately it blew, so figured I had a short somewhere in the 6 different ceiling light sets located in the 3 slide-outs. I disconnected the five switches controlling the lights in the living room and the kitchen slides. I also removed the wood paneling located under the mattress in the bedroom slide, this exposed the wires powering the lights in ceiling of the bedroom slide. These are small push lights with no switch, I disconnected the power wire for these lights. Tried another fuse and it did not blow, so I started re-connecting light switches. I started with stove light, it lit no issue, next connected switch controlling lights over TV, they also lit with no issue, moved to light switch controlling lights over the recliners, they also lit with no issue, repeated this process for wall lights and the ceiling light over the table, these also lit with no issues. So I had isolated the problem as being a shorted power wire in the floor, wall or ceiling of the bedroom slide used to power the ceiling lights in this slide. I thought OK I can live without these lights working. I know the lights power wire is shorted (grounded) but what if I wired the power wire from fused control panel to the lights ground wire and made the lights hot wire the ground, would these lights work? I also swapped the hot and ground wires attached to each light. I tested this light circuit using a 12 volt battery trickle charger, I used a fused wire harness on the hot side of the charger, and they lit and worked fine. Left them on for a couple of hours with no issues. I left a piece of white tape attached to these wires with a note explaining why this circuit is wired in this manner. Hopes this explanation helps someone having a similar lighting issue. I thank everyone for their comments and suggestions. I also talked to Anita Carpenter, Cardinal Customer Service, she was very helpful and provided the wiring diagrams for the 12 volt and 110 volt systems for my fifth wheel.
Her contact info is:
my direct line at (574) 367-3312 or via email at acarpenter@forestriverinc.com