Double-check your connections. Hooking Red to Negative can damage both the charger and your battery. Where to Find a Digital Copy?

Clip the charger clamp to a heavy, unpainted metal part of the vehicle engine block or chassis (if the battery is still in the car). If the battery is outside the vehicle, attach the black clamp directly to the Negative (NEG, N, or -) battery terminal. Step 4: Plug In and Monitor

functions as a dual-rate manual and automatic battery charger. It is primarily engineered for standard 6V and 12V lead-acid automotive batteries. Specification 6V and 12V DC Input Voltage 120V AC, 60Hz Battery Chemistry Lead-Acid (Standard, Maintenance-Free, AGM) Control Style Microprocessor Controlled Display Safety Certifications UL Listed / CSA Compliant Crucial Safety Precautions