TM 10-3930-659-20 6-58. UNDER CAB WIRING HARNESS MAINTENANCE Con't). 6. Disconnect under cab wiring harness connector (15) from engine frame wiring harness connector (14). 7. Disconnect under cab wiring harness connector (16) from loader frame wiring harness connector (17). 8. Disconnect two under cab wiring harness connectors (18) from brake light switch (19). 9. Disconnect two under cab wiring harness connectors (21) from left low brake pressure switch (20). TA707865 6-195