Connect the red alligator clip to the positive (+) terminal of a 12V or 24V battery.
If you need help using your device for a specific vehicle fix, please let me know: qdb-2a manual pdf
A downloaded PDF is only useful if you can find it next year. Implement this system: Connect the red alligator clip to the positive
QDB-2A Manual PDF: Download and Setup Guide qdb-2a manual pdf