We need an electric wiring diagram for an 1989 or 1990 liberty mobile home

You will need to contact the manufacturer:

Manufactured Homes - Modular Homes - Liberty Homes, Inc. | High Quality Modular & Manufactured Housing (http://www.libertyhomesinc.com/)

I need to get the wiring diagram for the 2002 Liberty modular home, we bought second hand... they were not with the paper work from the previous owner.

Thank you
Debi Short

Modular homes do typically provide diagrams to the owners. They are usually left inside the breaker panel.
It is highly doubtful you'll be able to get a duplicate copy, and even if they are available it will be from the original manufacturer only.

Why do you need them?