Honda HSM1380i Owner's Manual page 120

Jump starting
Start the engine using the two 12V booster batteries, which are
connected in series.
1. Connect jumper cable A to the positive (+) terminal (1) on booster
battery A. Connect the other end to the negative (–) terminal (2) on
booster battery B.
2. Connect jumper cable B to the positive (+) terminal (3) on the snow
thrower. Connect the other end to the positive (+) terminal (4) on
booster battery B.
3. Connect jumper cable C to the negative (–) terminal (5) on booster
battery A. Connect the other end to the ground bolt (6) on the snow
thrower.
4. Start the engine (see page 45).
5. Remove the jumper cables in the reverse order.
GROUND BOLT
JUMPER CABLE C
JUMPER CABLE A
118
POSITIVE ( + ) TERMINAL
NEGATIVE ( - ) TERMINAL
POSITIVE ( + ) TERMINAL
BOOSTER BATTERY B
BOOSTER BATTERY A
(Two 12 V batteries are connected in series)
JUMPER CABLE B
NEGATIVE ( - )
TERMINAL
POSITIVE ( + )
TERMINAL