Okay, so I am editing a model in zmodler, and I add a light bar that goes on fine and works in game. So I go back and edit the car and add interior lighting and when I spawn in game, the original light bar works fin, the interior lighting stays a solid color. Can anyone help me out, could this be a hierarchy issue?

You need to attach or re-name the extra files. I created a tutorial about this some time ago, give it a read, it may help you. http://www.lcpdfr.com/tutorials/index.action/grand-theft-auto-iv/vehicle-modification-tutorial/attaching-extras-in-zmodeler-r96/

Okay, so I am editing a model in zmodler, and I add a light bar that goes on fine and works in game. So I go back and edit the car and add interior lighting and when I spawn in game, the original light bar works fin, the interior lighting stays a solid color. Can anyone help me out, could this be a hierarchy issue?

please include a screenshot of the hierarchy 

This topic has been moved to the appropriate forum. Please post in the correct location in the future.

Thanks guys for your help, I figured it out!