My 2017 257 was prewired.You can look for a 10 Gauge pair of wires up there that go back to the fuse panel under the dash.
My 265 had them and I didn't have a winch.
They are for the solenoid, not for powering the winch itself. You need 6 gauge wire for that and a 70A breaker at the battery.
I did call this morning but the customer service person is on vacation until November 14. I will take a closer look when I am at the boat. I' hoping it has the wiring. The dealer thought it should.Call Grady and ask.
Where do they originate? Are you prewired to the chain locker?I spoke with Carolyn at Grady and she said that the 6 guage wiring is included in the harness whether it has a factory windlass or not. She sent a picture of where they will be. They terminate at the helm. That is very good news!!
That would do as long as the accessory panel can handle the extra current draw.On my 255, the windlass harness was coiled up and ziptied inside the anchor locker. The other end was also coiled and found inside the console near the power block.