1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 77Get this manual

CHARGING AND STARTING SYSTEM
RectifierRegulator (PN 853358T1) Diode Test
WARNING
Disconnect battery leads from battery before testing rectifier
Digital Meter (DMT 2000 or Equivalent)
NOTE:Voltage regulatorrectifier specifications are given for informational purposes onlyUse the appropriate troubleshooting techniques previously mentioned to find the faulty component in the charging system
BLKBlack REDRed YELYellow

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