With the engine stopped, connect the tester's black clip to the negative (-) battery terminal, then touch the red lead to the positive (+) battery terminal.
1. If LEDs 1 through 3 light, the battery is good.
NOTE: Some late model or large vehicles might cause 4 LEDs to light. This is normal.
2. If fewer than 3 LEDs light, the battery needs maintenance.
3. If no LEDs light, the battery is totally dead and may be defective.