SERVICE MANUAL NUMBER 24
CHARGING SYSTEM
b. Continuity should be present in all three cases (meter should move). If it does not,
one or more of the windings are open and stator must be replaced.
a
b
b
b
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Testing Stator
a - Test 1
b - Test 2
3.
A short in the stator is difficult to detect without special equipment, because of the low
windings resistance. If all other electrical components test out good, and alternator fails
to produce rated output, stator probably is shorted and should be replaced. Also,
examine stator for heat discoloration, as this usually is a sure sign of a short.
RECTIFIER AND DIODE ASSEMBLY
NOTE: Failure of any component in tests following will require replacement of entire rectifier
assembly.
NEGATIVE (–) RECTIFIER
IMPORTANT: Rectifier MUST BE disconnected from stator for this test.
CAUTION
DO NOT use a test instrument with more than a 12 volt source (in the following test),
as rectifier may be damaged.
1.
Connect one lead of an ohmmeter (set on R x1 scale) to negative (–) rectifier heat sink
and the other lead to one of the rectifier terminals. Note the reading.
2.
3.
Reverse leads and again note reading.
Meter should indicate a high or infinite resistance (no meter movement) when
connected one way and a low reading when connected the other. If both readings are
high or infinite, rectifier is open. If both readings are low, rectifier is shorted.
4.
Repeat Steps 1. through 3. for two other rectifiers in heat sink.
90-861327--1
OCTOBER 1999
Page 4C-13
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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