1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 31Get this manual
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Battery Precautions Recommended Battery Operating Engine without Battery Specific Gravity Readings Specific Gravity Cell Comparison Test Electrolyte Level Charging Discharged Battery Winter Storage of Batteries Optional Voltage Regulator Test Battery Charging System (9 Ampere Alternator) Description Models Equipped with Rectifier Models Equipped with Regulator Battery Charging System Troubleshooting Stator Ohms Test (Alternator Coils Only) Standard Stator (Alternator Coils) Amperes Output 16 Amp Alternator System Test (Large Finned Voltage RegulatorRectifier) 16 Ampere Alternator System Test (Small Voltage RegulatorRectifier) Optional 24 Amp Alternator System Test (Large Finned Voltage RegulatorRectifier) Tachometer Terminal Block (Design 1) Description Testing Tachometer Terminal Block (Design 1) Tachometer Terminal Block (Design 2) Description Tachometer Terminal Block (Design and 2) Removal Installation