Join Date: Feb 2007
Location: Edmonds, WA
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From my own experience rewiring a boat:
Do the AC wiring first because:
(1) You generally want to keep the AC wires away from the DC wires to avoid introducing 60 Hertz hum in DC devices. That means you can often replace AC wiring without disturbing the DC wiring.
(2) When the AC is done, you'll have convenient power that you'll need for the DC rewire: namely good lighting and a heat gun.
(3) Bad AC wiring can be far more dangerous that bad DC wiring. A corroded wire nut can easily create a fire. (Wire nuts should never be used on a boat.) And AC voltages can easily kill a person.
(4) AC wiring is generally simpler than DC wiring. There's less of it and the wires are smaller and more manageable. You'll have an opportunity to test your abilities before the much larger DC rewire project.
All that having been said, be sure to think through your AC needs before you get started. And read up on marine wiring standards. Marine AC is very different from home AC.