Hitachi 120-3 class Operator's Manual page 259

• Fusible Link (Main Fuse)
In case the starter won't rotate even if the key switch is
turned to the START position, fusible link may the cause of
the trouble. Remove the cover next to the engine coolant
reservoir to check the fuse. Replace it if blown.
21- + Side (Red)
22- − Side (Black)
MAINTENANCE
45A
65A
21
Battery
7-67
22
M1U1-07-023