SERVICE MANUAL NUMBER 30
CHARGING SYSTEM
Troubleshooting Tests (Alternator on Engine)
Use the following tests in conjunction with SECTION 1 - Troubleshooting. Before
proceeding with the tests, perform the following checks to eliminate possible problem areas.
Also observe Precautions, preceding, to prevent damage to alternator system.
1.
An undercharged battery can be caused by excessive current draw, from accessories
or by operating the engine at low speeds for extended periods.
2.
Check physical condition and battery charge. Battery MUST BE at least 75% (1.230 spe-
cific gravity) of fully charged to obtain valid results in the following tests. If not, charge
battery before testing system.
3.
4.
Inspect entire charging system wiring for defects. Ensure all connections are secure and
clean.
Check alternator drive belt for excessive wear, cracks, fraying and glazed surfaces. Re-
place if necessary. Also, check drive belt tension and adjust if necessary.
Charging System
1.
2.
Check belt condition and tension.
Check battery condition.
X.X
+
–
–
+
76498
3.
4.
With a fully charged battery, connect voltmeter leads directly to the battery posts.
Start engine and run at 1300-1500 rpm. Read voltmeter in VDC position. Most systems
will read 13.8-14.8 volts.
NOTE: If the voltage reading is within specifications, switch voltmeter to AC volt position.
There should not be more than a 0.250 AC voltage reading with the engine running. A read-
ing more than 0.250 AC volts indicate defective diodes in the alternator.
INDEX
90-863161
SEPTEMBER 2000
Page 4C-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 496 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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