1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 38Get this manual

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16 Ampere Alternator System Test (SMALL VOLTAGE REGULATORRECTIFIER) 1 Check battery voltage at battery with engine running2 If battery voltage is above 14.5 volts, replace voltage regulatorrectifierCh

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