SERVICE MANUAL NUMBER 30
CHARGING SYSTEM
Circuitry
Perform the following tests, using a 0-20 volt DC voltmeter, to ensure that all of the circuits
between the alternator and the other components within the charging system are in good
condition.
OUTPUT CIRCUIT
1.
Ensure battery is fully charged with the hydrometer test.
Start engine and increase RPM to approximately 1500 rpm.
2.
3.
Check voltage reading. The voltage should read between 13.8 and 14.2 volts. If the
reading is below 13.8 volts:
a. Connect positive (+) voltmeter lead to alternator output post.
b. Connect negative (–) lead to ground post on alternator.
c. Wiggle engine wiring harness while observing voltmeter. Meter should indicate ap-
proximate battery voltage and should not vary. If no reading is obtained, or if reading
varies, Resistance in this section.
d
a
e
c
72784
b
Typical
a - Output Wire - ORANGE
b - Excitation Wire - PURPLE
c - Sensing Wire - RED/PURPLE
d - Voltmeter (0-20 Volts)
e - Ground
INDEX
90-863161
SEPTEMBER 2000
Page 4C-11
| 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 |
| Download File |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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