ELECTRICAL SYSTEM KEY DESCRIPTION KEY DESCRIPTION 1 - REVERSE WARNING HORN 44 - INSTRUMENT PANEL HARNESS 2 - REVERSE WARNING HORN LEAD 45 - INSTRUMENT PANEL WITH INSTRUMENTS 3 - [03B04] ELECTRICAL SYSTEM 9015 670 and 670 (Automatic Blade Control System) Graders PC1519 in GRADER, MOTOR 670