ELECTRICAL SYSTEM KEY DESCRIPTION KEY DESCRIPTION 1 - REVERSE WARNING HORN 11R- ENGINE OIL PRESSURE GAUGE 2 - REVERSE WARNING HORN LEAD 11S- IGNITION SWITCH 3 - REAR WORK LIGHTS [03D13] ELECTRICAL SYSTEM 9015 770 and 770 (Automatic Blade Control System) Motor Graders PC1504 in GRADER, MOTOR 770