The absolute first thing I would do is
Charge up the truck battery(s) to full as I could get them
Charge up the camper battery(s) the best you can
Now... unplug the camper from the truck.
leave the area for a day or night,
Check the truck, check the camper
which one is run down
Now you have cut your problem in half
leave them disconnected while you work on the "bad" half
.......................................
If it's the truck... disconnect the CW fix... observe for a while
Look for chaffed wires in the system with the blown fuse.
Then visually inspect all wires
------------------------
If its the camper contact the manufacturer... with your model and serial numbers... ask them for a wiring diagram.
Ask the previous owner what modification they made if possible.
Sometimes a dealer will ask the previous owner to contact you
I hope a methodology like this will help you without doing more or unnecesary damage
Good luck, we are all pulling for you.
Sleepy
