Welcome to TechIMO!
Best advice? Stop by AutoZone or Advance to purchase a repair guide for the vehicle. Skim it through the text before purchasing to be sure, but most of these guides include full wiring diagrams for the electrical systems.
Only with the wiring diagram would I attempt to start work on such a project. Personal opinion, however....
BTW, assuming is a stock unit, the CB could have simply been wired off the backside connectors of your cigarette lighter.
Good Luck,
Robert Richmond