I have no diagrams for a Pace Arrow, but most vehicles have what is called a "Fusible Link" supplying power to much of the system. These are just a too-small piece of wire. They are usually near the main engine battery. Because this piece is small, they break frequently and they break inside the insulation so the failure is not obvious.
A lifelong waterman and his bride going dry places for as long as the fuel money lasts.