Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 128Get this manual

WIRING DIAGRAMS
IMPORTANT: On installations where gauge options will not be used, tape back and isolate any unused wiring harness leads
STARBOARD INSTALLATION

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