GMC Cab & Chassis K3500 (1985-2000) Transfer case circuit, except k300

4 WHEEL CONTROL DRIVE MODULE LOW (UNDER RIGHT SIGNAL END OF I/P) 4 WHEEL DRIVE INPUT (NOT USED) AUTOMATIC TRANSMISSION ONLY BLK WIRE BRN WIRE BRN/WHT WIRE CONVENIENCE CENTER (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK GRN WIRE EHCU MODULE (NEAR MASTER CYLINDER) FRONT AXLE ACTUATOR SOLENOID (RIGHT SIDE OF FRONT DRIVE AXLE) FRONT AXLE SOLENOID SWITCH (RIGHT REAR SIDE OF FRONT DRIVE AXLE) FUSE GRY WIRE HOT IN RUN I/P FUSE BLOCK INDICATOR LAMP INSTRUMENT CLUSTER LT BLU WIRE PANEL DIMMER SWITCH (ASSEMBLY) PANEL LPS FUSE PICKUP PNK/WHT WIRE POWERTRAIN PPL RWAL DIODE MODULE (UNDER LEFT SIDE OF I/P) SUBURBAN, YUKON TRANSFER CASE MODE SELECTOR ILLUMINATION LAMP (AT TRANSFER CASE SELECTOR LEVER) TRANSFER CASE SWITCH (LEFT TOP OF TRANSFER CASE)