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

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CHARGING AND STARTING SYSTEM
DIODE TEST
1 Set Ohm meter to 1K scale2 Connect Black () meter lead to RED regulator lead3 Connect RED (+) meter lead to YELLOW regulator leadTest4 Connect RED