Connecting to the Battery. Identify the correct polarity of the battery terminals. The positive battery terminal is typically marked by these letters or symbols (POS, P,+) and RED. The negative battery terminal is generally marked by these letters or symbols (NEG, N,-) and BLACK.
Step1:
Connect the positive (red) battery clamp to the positive (POS, P,+) battery terminal and the negative (black) battery clamp to the negative (NEG, N,-) battery terminal.
Step 2:
Make sure all of the vehicle’s power loads (headlights, radio, air conditioning, etc.) are turned off before attempting to jump-start the vehicle.
Press the power button to begin jump-starting, and all LEDs will flash once. If you are properly connected to the battery, the white boost LED will illuminate, and the battery charge LEDs will chase. A 60-second timeout countdown will begin as soon as a battery is detected.
Try starting the vehicle. Most vehicles will immediately start. If the vehicle does not start right away, wait 20-30 seconds and try again. After the 60-second timeout is complete, the unit must be powered off and then back on to initiate a new jump-start sequence. Do not attempt more than five (5) consecutive jump starts within a fifteen (15) minute period. Allow the GBX75 to rest for fifteen (15) minutes before attempting to jump-start the vehicle again.
Once you have started your vehicle, power off the unit, disconnect the battery clamps, and remove the GBX75. Take POS off first, then the NEG.
**Low Voltage Batteries & Manual Override**
USE ONLY IF BATTERY IS COMPLETELY DEAD
The GBX75 is designed to jump-start 12-volt lead-acid batteries with a voltage as low as 3 volts. If your battery is below 3 volts, the Boost LED will be «off». This is an indication that the GBX75 can not detect a battery. If you need to jump-start a battery below 3 volts, there is a manual override feature, which allows you to force «on» the jump-start function.