ELECTRICAL SYSTEM - SKIDDER AND GRAPPLE SKIDDER KEY DESCRIPTION KEY DESCRIPTION 1 - BOOM LIGHTS (GRAPPLE SKIDDER ONLY) 13 - FRONT CANOPY LIGHTS (GRAPPLE 2 - LOG ARCH HARNESS (GRAPPLE SKIDDER ONLY) [03B08] ELECTRICAL SYSTEM 9015 440C Log Skidder and Grapple Log Skidder PC1523 in SKIDDER, LOG 440C