TM 10-3930-659-20 6-58. UNDER CAB WIRING HARNESS MAINTENANCE (Con't). 4. Disconnect  two  under  cab  wiring  harness  con- nectors (7) from right low brake pressure switch (8). 5. Remove screw (13), washer (12), cab ground terminal lead (11), and under cab wiring harness (10) from cab (9). TA707864 6-194