It's ether one of two things:
1. There are two types of Mods, single player mods and multiplayer mods. They are not compatible. Make sure you're using the correct type for the game mode you want to play.
2. to get the Mod to show up in the mod menu you gotta it put into a new seperate folder (with the name of what you want it to be listed as in the Mod Menu) in the /gamedata folder.
---Jedi Guardian of the Newbie Questions
---Masters of the Force Team Leader / Creator
---Open Jedi Project Lead Moderator / Co-Founder