Shift interlock circuit, motor home chassis for GMC Vandura P3500 (1985-1997)

85 30 PPL BLK WIRE BRAKE/ BRAKE/TRANSMISSION SHIFT INTERLOCK (BTSI) SOLENOID (ON STEERING COLUMN) BRN WIRE DK GRN/WHT WIRE HOT IN RUN I-3 FUSE I/P FUSE BLOCK PARK/NEUTRAL POSITION AND BACKUP LAMP SWITCH (LEFT OF TRANS) POWER- TRAIN CONTROL MODULE (LEFT OF DRIVER'S ISLAND) PPL PPL CRUISE CONTROL MODULE TORQUE CONVERTER CLUTCH AND STOP LAMPS SWITCH (REAR OF BRAKE SUPPORT BRACKET) TURN-B/U FUSE VEHICLE CONTROL MODULE (TOP OF RADIATOR SUPPORT) IGN YEL WIRE