Hummer H24 User Manual page 7

Attention:
If both (12V Indicator) & (24V Indicator) are flashing rapidly, means incorrect
•
connection of the jumper cable clamps and battery terminals, reverse polarity
protection will be in place to cut the power. Please check and reconnect it.
Many vehicles feature alternate starting points, away from the Battery. Always
•
use the alternate starting points whenever available.
3. If (12V Indicator) is ON, it's ready to jump start 12V vehicle. To jump start a 24V
vehicle, please press down the (BOOST Button) for 2-3 seconds until the (24V Indicator)
is ON, it's ready to jump start.
4. Now attempt to start the engine. If engine does not start, wait at least 10 seconds
before attempting to start the engine again.
5. After jump starting, disconnect the BLACK NEG (–) clamp first, then disconnect the
RED POS (+) clamp. Leave the vehicle's engine running.
12V Indicator is on
12V OFF 24V for 12V
Red
Black
24V Indicator is on
12V OFF 24V for 24V