The owners manual for the Cutwater 28 was produced in circa 2014. In about 2016 the C-28 was substantially changed to allow placement for a bigger generator. This resulted in a big number of both small and big changes that are not reflected in the C-28 owners manual.
The black water tank was repositioned and the macerator dump port moved. Wiring to a bunch of systems was rerouted. Battery locations were changed. Switches were moved. In my boat a third seacock dedicated to the head was added.
The C-28 manual is a good place to start understanding how things are laid out in general. Like the towing light feature.
But realize that, if you have a post 2016 C-28, the manual will be incorrect a lot of the time. All that said I downloaded the C-28 owners manual to my phone and I’m still referring to it many, many times each year.