1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 208Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 208

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POWER TRIM
Full Continuity (Rx1) Full Continuity (Rx1)

Replace the relay that does not have continuity3 Connect voltmeter to the heavy BLUE lead and to groundYou should have 12 volt