Check the listing for details. 1994 Thunderbird and Cougar Electrical Troubleshooting Manual 94 Ford Mercury. Condition: Used. Listed at 19.00 USD. "1994 Thunderbird/Cougar Electrical & Vacuum Troubleshooting Manual" Written for Ford dealership mechanics, this book will help you troubleshoot or diagnose electrical and vacuum problems. You will find electrical and vacuum diagrams broken down so that you can perform specific tests. Look for troubleshooting maps and/or diagnostic trees designed to take you through the process of finding your problem(s) step by step. The specifications in this book will help you to understand connector configurations, and locate & identify harnesses, circuits, relays, and grounds. The vacuum diagrams indicate flow, valve & sensor locations, hose colors, and vacuum distribution. In many cases, this type of book can be used in place of a wiring and/or vacuum diagram.