CHARGING SYSTEM
SERVICE MANUAL NUMBER 30
EXCITATION CIRCUIT
1.
2.
3.
Connect positive (+) voltmeter lead to tie strap terminal on alternator and negative (–)
lead to a ground terminal on alternator (Test 1).
Turn ignition switch to ON position and note voltmeter reading. Reading should be 1.3
to 2.5 volts.
If no reading is obtained, an opening exists in alternator excitation lead or in excitation
circuit of regulator. Unplug PURPLE lead from regulator. Connect positive voltmeter
lead to PURPLE lead and negative voltmeter leads to ground (Test 2). If voltmeter now
indicates approximate battery voltage, voltage regulator is defective and must be
replaced. If no voltage is indicated, check excitation circuit for loose or dirty connections
or damaged wiring.
SENSING CIRCUIT
1.
2.
Unplug RED/PURPLE lead from voltage regulator.
Connect positive (+) voltmeter lead to red/purple lead and negative (–) voltmeter lead
to ground terminal.
3.
Voltmeter should indicate battery voltage. If battery voltage is not present, check sens-
ing circuit (red/purple lead) for loose or dirty connection or damaged wiring.
d
a
e
c
72786
b
Typical
a - Output Wire - ORANGE
b - Excitation Wire - PURPLE
c - Sensing Wire - RED/PURPLE
d - Voltmeter (0-20 Volts)
e - Ground
INDEX
Page 4C-12
90-863161 SEPTEMBER 2000
| 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 |
(2 votes, average: 4 out of 4)
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Great down load . it was all there an more