Crestliner is really good about following ABYC wire color codes. If you have the color codes you really don't need a schematic. That's why the standard was developed and its why its rare to find a schematic for a boat.
I could probably recite them for you off the top of my head but if you do a search there's a sticky on one of the forums.
That'll work. Quick note, purple is often thought of as only accessories but it's more appropriate to think of it as powering things via a key switch. Orange is power to things that you don't want a key such as bilge pumps and nav lights. The feed side is orange and the accessory side is the whatever color it's supposed to be for the accessory. For instance, orange feed to a switch with a gray wire on the other side would be nav lights. The anchor and nav light switches are separted with a diode that will look a little strange. That is there so you only need to wire the light once not twice.
