Shift interlock circuit, commercial chassis for GMC Vandura G2500 (1985-1995)

BACKUP LAMP SWITCH (ON STEERING COLUMN) BLK WIRE BRAKE SHIFT INTERLOCK RELAY (ON STEERING COLUMN) BRAKE/TRANSMISSION SHIFT INTERLOCK SOLENOID (ON STEERING COLUMN) DK BLU WIRE DK GRN/WHT WIRE ENGINE CONTROLS SYSTEM PPL FUSE BLOCK HOT IN ACC OR RUN HOT IN START OR RUN PNK/BLK WIRE PPL PPL PPL TCC/ BRAKE SWITCH (ON BRAKE PEDAL SUPPORT BRACKET) TRANS FUSE TURN-B/U FUSE