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With the engine running between 1800 to 2600 rpm,
and from battery negative
terminal to regulator-
observe the panel ammeter (if not already equipped,
rectifier case. If battery voltage remains low with
connect a test ammeter).
If no charging is evident,
engine running, proceed to step
3.
proceed with the Alternator Output Test.
3.
Disconnect plug from regulator-rectifier and test
the AC voltage at the plug with engine running near
3600 rpm. If AC voltage reads more or less than
specified in Table 1, proceed to step 4. If AC voltage
is as specified but
DC voltage is low, replace
ALTERNATOR OUTPUT
TEST
regulator-rectifier.
Use a volt-ohmmeter such as the Simpson 270, when
4. Use the R x l scale on the ohmmeter for
detecting
testing the charging system.
opens in the stator (unit not running Disconnect
1. With the engine running, check the
battery terminal
voltage (regulator output)
using a DC voltmeter.
Voltage output should be within the values specified
in Table 1. If voltage is greater than
specified
replace regulator-rectifier assembly. If voltage is
less than specified, proceed to step 2.
plug from regulator'-rectifier. Connect ohmmeter
test leads to wires coming
from stator. Refer
to
Table 1 for resistance specifications. If resistance is
not as specified, replace stator. If stator resistance
readings are as specified and windings are not
shorted to ground, low AC voltage may be due to
loss of magnetism If so, blower wheel assembly
2. Examine all wires for loose, corroded, broken
must be replaced Check for magnetism with steel
connections, short circuits, etc. Check fuses. Repair
tool blade. Next, connect one ohmmeter test lead to
as needed to assure complete
circuits from
regulator-
stator wire, connect the other test lead to ground. If
rectifier B+ terminal to battery positive terminal
the ohmmeter reading is low the
stator is grounded
and must be replaced.
TABLE 1. TESTING 15- AND 20-AMPERE SYSTEMS
PROCEDURE-.
I
1.
Battery
Battery
Voltage
unit not
running.
2. Regulator Battery Voltage after
unit is running
3 to
5
minutes.
3. Alternator Stator
output
unit not running.
and Wiring
Ohmmeter reading from stator
Check at plug.
4. Alternator
and Wiring
Measure AC open circuit stator voltage
with unit running. Measure between
two stator leads with plug disconnected
and unit running at approximately 3600 rpm.
12 VDC
13.6 to 14.7 VDC
0.1 to 0.2 Ohms
40 VAC minimum
60 VAC maximum
12 VDC
13.6 to 14.7 VDC
0.3 to
0.5
Ohms
31 VAC minimum
51 VAC maximum
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