Hi all. First post here. Bought a 2000 Starcraft Spacemaster with some mice damage as a fall project. The DC system wasn't working and I've troubleshooted it to this point where I am looking for a tip. Quick rundown on what I've done: Replaced the battery and fuses. Plugged into shore power and seems like the converter is fine (lights work on shore power). The issue seems to be at the battery connection and/or the connection to the trailer. I hooked the battery positive to the black wire that goes to the pup and get power. So the issue with how it was originally connected is to the trailer harness (or it is fauly). I've attached the schematic (with my drawing of where Im confused). If I splice the battery to the wire into the camper I have power. The issue seems to be that when I connect it to what runs to the TV it goes to the top right prong on this harness. With the 4 flat connection nothing touches this harness and power doesnt go back into the PUP. Attached is the picture of that harness. First off, what plug is this? I searched and found a 6 square but that doesnt touch the two right most prongs. Second, the previous owner connected a 4 flat to this. It seems like I could just scrap this harness and change it to a 7 pin? Would like to set up a trickle charge back to the battery if possible. Any advice would be greatly appreciated. Thanks!