Rangers, unless the new ones are different all have the same system.
Manual, provided you swithc your valves to automatic/fill, will run the pumps constantly. This is to fill the livewells in the morning, or to run constantly if you're trailering fish to a weigh in, etc.
The auto, on your CONSOLE, makes the relay turn the pumps on and off at different intervals depending on how you set your timer. That would be when you normally put your valve on "recyc". You can also use auto with it on fill, to periodically pump fresh water in.
Did that make sense?
Every up to date livewell system I have seen works like this.