Interior fuse keeps blowing

Also the tv didn't have any rca jack to the tv. So when I slide out the stereo to connect them. I noticed 3 rolls of white tape. With 8 wires going into each one. I unrolled the tape and found 4 speaker wires rolled into each roll of tape. I have since put on the proper connectors. Also when I added the drain plug for the refrigerator. I noticed a blue wire running randomly into the insulation. I carefully moved some of the insulation and the blue wire just fell out. I don't know what it goes to or if it's live. Thsts today's project. But it does have a connectors on it and I'm sure it either goes somewhere or needs to be capped off. I know absolutely nothing about rvs.. nothing.. But I have Google and you tube and people in here. I'm learning as fast as I can. Reading everything and watching every video I can find about rvs and how they work. I now have a basic understanding. I've built airplanes my whole life, so I'm not completely stupid. However airplanes are a totally different bread.I would gladly just stick with what I know. But this isn't going to diagnose itself. And because im not an authorized person to work on it. Im limited in how far I can go. I can test, and I can only look for now. I have all the tools needed and if i dont have something in will go buy it) I will do anything to needed to be safe. At this point. I'm sure I'm forgetting a few things. But at this point ive told you all everything I know.