Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 45Get this manual

OUTBOARD MOTOR INSTALLATION
Battery Cables
Single Outboard

aRED Sleeve (Positive)BLACK Sleeve (Negative)Starting Battery

Dual Outboard

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives