Trans Am Wiring Harness Technical PDF for 1980 Trans Am 1980 Trans Am & Firebird Electrical Wiring Diagrams. Below you will find a full electrical wiring diagram for use on 1980 Trans Am and Firebird units are in ZIP file format. Please feel free to use and pass along to fellow ownersthis infomation. A Special thanks to AGTA member turbota400 for 1980 trans am wiring | eBay www›Search›1980 trans am wiringFind great deals on eBay for 1980 trans am wiring. Shop with confidence. Skip to main content. eBay Logo: Wiring harness replacement stereo plugs for many 1975+ GM factory original radio (Fits: 1980 Trans Am) New (Other) $15. Guaranteed by Wed, Apr. 3. Buy It Now +$4 shipping.