1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 79Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 79

CHARGING AND STARTING SYSTEM
Analog Meter
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

DIODE TEST
1Set Ohm meter to 10 scale2Connect RED(+) meter lead to RED regulator lead3Connect BLACK () meter lead to either YELLOW or YELLOWBLACK regulator leadResistance Specification 100400 OHMS