Transmission Lockup TCC/OD Case Connector Wiring Diagram - 52 & 44 Switches

This is a color-coded, hand-drawn wiring diagram showing how to wire a transmission case connector for torque converter clutch (TCC) and overdrive (OD) lockup control. The transmission case connector (shown in yellow) has three pins labeled OD, 12V, and TCC. A red power wire runs from the battery positive terminal through a 20-amp blade fuse to the 12V pin of the case connector. Black wires from the OD and TCC pins route to two pressure switches, numbered 52 and 44, which mount on a bracket at the 'number 4 tap on trans.' A red callout labeled 'NOTHING GOES HERE' with arrows explicitly warns that the exposed upper terminals of the 52 and 44 pressure switches must be left unconnected. The diagram also shows a vacuum switch with terminals labeled nc, no, com, and a vac. port; battery positive feeds the 'com' terminal, and the vac. port connects via a gray line to manifold vacuum. The battery negative terminal is wired to engine ground at the motor. A reader learns the fuse size (20a), the case connector pinout (OD / 12V / TCC), the pressure switch identifiers (52 and 44) and their mounting location, and which switch terminals to leave empty.