Dive into a comprehensive troubleshooting session of the secondary circuit in a SNAP-ON MT665 automotive analyzer. Follow along as the repair process unfolds, starting from the harness pickups and progressing through the entire circuitry. Witness the challenges of working without a schematic or manual, encountering numerous dead ends and making unexpected discoveries. Gain insights into antique test equipment restoration and learn valuable techniques for diagnosing and repairing complex automotive diagnostic tools.