For USA

The headlamps are controlled by the lighting switch which is built into the combination switch. Power is supplied at all times
^ to lighting switch terminal (5)
^ through 15 A fuse (No. (27) located in the fuse and fusible link box), and
^ to lighting switch terminal (8)
^ through 15 A fuse (No. (28) ,located in the fuse and fusible link box).

Low beam operation
When the lighting switch is turned to the 2ND and LOW ("B") position, power is supplied
^ from lighting switch terminal (10)
^ to terminal (2) of the LH headlamp, and
^ from lighting switch terminal (7)
^ to terminal (2) of the RH headlamp.
Terminal (3) of each headlamp supplies ground through body grounds (E10) and (E33).
With power and ground supplied, the headlamp(s) will illuminate.

High beam operation/flash-to-pass operation
When the lighting switch is placed in the 2ND and HIGH ("A") position or PASS ("C") position, power is supplied
^ from lighting switch terminal (6)
^ to terminal (1) of the RH headlamp, and
^ from lighting switch terminal (9)
^ to terminal (1) of the LH headlamp, and
^ to combination meter terminal (5) for the high beam indicator.
Ground is supplied to terminal (4) of the combination meter through body grounds (M1) and (M60). Terminal (3) of each headlamp supplies ground through body grounds (E10) and (E33). With power and ground supplied, the high beams and the HIGH BEAM indicator illuminate.