I assume you have the 1995 EEC V PCM in this truck. On the OBD II DLC, pin 2 goes to PCM pin16--diag bus+. Pin 4 is ground. Pin 5 is ground to PCM pins 51, 76, 77, 103. Pin 10 goes to PCM pin 15--diag bus-. Pin 13 goes to PCM pin 13 for Flash EPROM. Pin 16 is ... Login to read more.