W250 3/4 Ton Pickup 4WD V8-318 5.2L VIN Y FI (1988)
Speed Control Switch: Testing and Inspection
Fig. 6 Speed Control Continuity Chart. 1988-90 Rear Wheel Drive Models
Fig. 7 Speed Control Continuity Chart. 1988-90 Front Wheel Drive Models
Fig. 8 Speed Control Connector Terminal Identification