Hummer H3 User Manual page 7

a. If the green indicator light is on, means ready to jump start.
b. If the red indicator light is on, means a misconnection between the clamp and battery
terminal.
c. If the red indicator light is blinking, means Reverse Charge protection is activated or
Low Battery.
d. If no light is on, press the BOOST button for 3 seconds until the green indicator light
turns on, by which time the jump starter is ready for use.
5. Once the vehicle has been successfully jump started, disconnect the jumper cable
clamps from the vehicle battery terminals.
Green
Red
R: red clamp
B: black clamp