A little more info would help. Are you replacing the existing camera with a new, identical device. Or, are you going to replace the camera with a new system...wireless or wired? Are you replacing the camera for a better one or did the existing camera fail. Since you have a Sunseeker it's highly likely you have the system from RVS. To verify, look under the dash and around the steering column you'll see a silver box that looks like this:
If that's what you have then the existing wiring is proprietary and probably won't work with any other brand. If replacing with a like camera just move the wires from the old one to the new one. Also, it's possible that there is a failure of the -501 control box.