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Mercury 30 Service Manual

Mercury 30
332 pages
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2B-0 - ELECTRICAL 90-826148R2 MARCH 1997
Table of Contents
Page
Specifications 2B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 2B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 2B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Precautions 2B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Battery 2B-1. . . . . . . . . . . . . . . . . . . .
Operating Engine Without Battery 2B-1. . . . . . . . . .
Specific Gravity Readings 2B-2. . . . . . . . . . . . . . . . . . . .
Specific Gravity Cell Comparison Test 2B-2. . . . . . .
Electrolyte Level 2B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging a Discharged
Battery 2B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter Storage of Batteries 2B-3. . . . . . . . . . . . . . . . . . .
Battery Charging System
(14 or 18 Ampere Alternator) 2B-4. . . . . . . . . . . . . . . . .
Description 2B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electric Start Models 2B-4. . . . . . . . . . . . . . . . . . .
Manual Start Models 2B-4. . . . . . . . . . . . . . . . . . .
Battery Charging System
Troubleshooting 2B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stator Ohms Test-Alternator Coils Only 2B-5. . . . . .
9 Ampere Manual Stator
(S/N-0G589999 & Below) 2B-5. . . . . . . . . . . . . . .
9 Ampere manual Stator
(S/N-0G590000 & Above) 2B-5. . . . . . . . . . . . . .
14 Ampere Stator 2B-5. . . . . . . . . . . . . . . . . . . . . .
16 Ampere Stator
(S/N-0G590000 & Above) 2B-5. . . . . . . . . . . . . .
18 Ampere Stator 2B-5. . . . . . . . . . . . . . . . . . . . . .
Alternator System Test 2B-6. . . . . . . . . . . . . . . . . . . .
9 Ampere Stator 2B-6. . . . . . . . . . . . . . . . . . . . . . .
9 Ampere Stator (S/N-0G589999 & Below) 2B-6
9 Ampere Stator (S/N-0G590000 & Above) 2B-6
14/16/18 Ampere Stator 2B-6. . . . . . . . . . . . . . . .
Rectifier Test 2B-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Regulator/Rectifier Test
Models with (S/N-0G590000 & Above) 2B-9. . . . . .
Diode Test: 2B-9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Results: 2B-9. . . . . . . . . . . . . . . . . . . . . . . . . .
Diode Test: 2B-9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Results (1ST reading): 2B-9. . . . . . . . . . . . .
Test Results (2ND reading): 2B-9. . . . . . . . . . . . .
SCR Test: 2B-9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Results (Both Test): 2B-9. . . . . . . . . . . . . . . .
Tachometer Circuit Test: 2B-9. . . . . . . . . . . . . . . .
Test Results: 2B-9. . . . . . . . . . . . . . . . . . . . . . . . . .
Starting System 2B-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter Motor Amperes Draw 2B-10. . . . . . . . . . . . . . .
Starting System Components 2B-10. . . . . . . . . . . . . .
Description 2B-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting the Starting Circuit 2B-10. . . . . . . . .
Starter Solenoid Test 2B-10. . . . . . . . . . . . . . . . . . .
Starter Motor 2B-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 2B-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly 2B-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning and Inspection 2B-14. . . . . . . . . . . . . . . . . . .
Testing 2B-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armature Test For Shorts 2B-14. . . . . . . . . . . . . . .
Armature Test For Ground 2B-15. . . . . . . . . . . . . .
Page
Checking Positive Brushes and Terminals 2B-15
Testing Negative Brushes For Ground 2B-15. . . .
Brush Replacement 2B-16. . . . . . . . . . . . . . . . . . . . . . .
Reassembly 2B-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 2B-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Mercury 30 Specifications

General IconGeneral
Horsepower30 HP
Cylinders3
Displacement526 cc
Gear ShiftF-N-R
Fuel Induction SystemElectronic Fuel Injection (EFI)
Shaft Length20 in
SteeringRemote / Tiller

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