Oh Yeah been there done that on 2 old EZGO's we bought at a car auction. We did find one source online for the manual and parts . I'll warn you now they get$58 bucks for the thing but it will help you a great deal in putting the Old EZGO back in shape.
The link is below. They handle parts for most Golf and Utility carts so just follow the EXGO thread under manufacturer.
Good Luck with your project.
http://www.powellscartsandparts.com/