Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 53Get this manual

OUTBOARD MOTOR INSTALLATION
Battery Cable Connections
Single Outboards
aRed Sleeve (Positive)Black Sleeve (Negative)Starting Battery

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