Good advice. I feel like I understand the system now, and what goes to what. I mapped the hoses and wires and scanned it into my computer. I'm also saving lots of pictures. Most of it looks straightforward and easy to get to. What I was worried the most about turned out to be electrical wires that went into a bundle. They should not be a problem.
2005 Alpine Coach 36 FDDS
with Cummins ISL 8.9L 400hp