Connect the positive (red) lead first. To prevent sparks, the negative (black) lead should ideally be connected to a grounded metal part of the vehicle body rather than the negative battery post directly. Troubleshooting Common Issues
Always wear safety glasses. Battery acid can cause permanent blindness. carquest battery charger cq 80cr manual
Attach the to the negative (-) terminal or a clean, unpainted metal part of the vehicle frame (earth point). Connect the positive (red) lead first