Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 68Get this manual

CHARGING SYSTEM
3Remove and discard rubber plug (a) from bottom cowl4Refer to Wiring Diagram II.A" and route extension harness (b) thru opening (c) in bottom cowl

- PlugHarnessClamp (existing)Grommet (provided)

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