Hello, and I doubt you will find a wiring diagram or schematic. Now I will get you started, and see how far you want to go. #1, must use high pressure tubing, the clear stuff and screw clamps are a wreck waiting happen.
Most new trailers come with pex tubing, which uses crimp rings, and a special crimping tool.
Now, does your trailer have a fresh water tank? Yes, we hope, you will have to add a fitting to near the bottom, to provide a suction line for the pump. Mount the pump, run a positive and negative wire to it, run the suction line to it, add a pressure style faucet to the sink, now run a pressure line from the pump to the pressure faucet the sink. Don't know how many holes you will have to drill, how to hide the plumbing, ect. If you camp below 32 degree temps, all pluming must stay in the camper to keep from freezing. Also make sure you put in a low point drain, and be ready to winterize. Sound like an easy enough task for you to start?
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT