1983 Honda Shadow 750.the battery seems to drain when you run the bike long enough where the radiator fan is running. I have had the battery checked out and it's fine. What else should you check?

If the battery is slowly going down, it's probably the charging system. Batteries are only storage devices, and only store electrical energy that is created elsewhere, in this case, by the charging system. If your charging system is getting weak it might not be able to keep up with the radiator fan.