CHARGING SYSTEM
SERVICE MANUAL NUMBER 24
c. If reading is high or infinite (no meter movement), high resistance or an open exists
in the field circuit. Check for poor connections between field winding leads and slip
ring terminals. If cause for open or high resistance cannot be found, connect ohm-
meter directly to slip ring terminals. If correct reading is now obtained, or if reading
is still high or infinite, replace complete rotor assembly.
d. If reading is low, a short exists in the field circuit. Inspect slip rings to be sure that
they are not bent and touching outer slip ring. Also, be sure that excess solder is not
shorting terminals to aft slip ring. If cause for short cannot be found, unsolder field
winding leads from slip ring terminals and connect ohmmeter directly to leads. If
correct reading is now obtained, or if reading is still low, slip rings and rotor field
windings are shorted, and complete rotor assembly must be replaced.
d
b
c
a
73112
a - Field Winding Leads
b - Slip Rings
c - Rotor Shaft
d - Pole Pieces
2.
Test rotor field circuit for grounds (Test 2), using an ohmmeter (set on R x1 scale) as
follows:
a. Connect one lead of ohmmeter to either slip ring and the other lead to rotor shaft or
pole pieces.
b. Meter should indicate no continuity (meter should not move).
c. If continuity does exist, complete rotor assembly must be replaced.
IMPORTANT: If alternator has output at low speeds, but no output at high speeds,
rotor field winding may be shorting or grounding out, due to centrifugal force.
Replace rotor if all other electrical components test good.
STATOR
IMPORTANT: Stator leads MUST BE disconnected from rectifier for this test.
1.
Test stator for grounds (Test 1), using an ohmmeter (set on R x1 scale) as follows:
a. Connect one lead of ohmmeter to one of the stator leads and the other lead to stator
frame. Be sure that lead makes good contact with frame.
b. Meter should indicate no continuity (meter should not move). If continuity does exist,
stator is grounded and must be replaced.
2.
Test for opens in stator (Test 2), using an ohmmeter (set on R x1 scale) as follows:
a. Connect ohmmeter between each pair of stator windings (three different ways).
Page 4C-12
90-861327--1 OCTOBER 1999
| 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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