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Charging System
Regulator Circuit Check
• Prepare the following:
Test Light Bulb: one 12 V 3.4 W bulb
Batteries: three 12 V batteries
Wires: five wires of appropriate lengths
CAUTION
The test light works as an indicator and also a cur·
rent limiter to protect the regulator/rectifier from ex·
cessive current. 00 not use an ammeter instead of
a test
light.
• Check to be sure the rectifier circuit is nannal before con-
tinuing.
Regulator Circuit Test·1 5t Step:
• Connect the test light and the 12 V battery to the regula-
tor/rectifier as shown.
• Check Y1, Y2, and Y3 terminal respectively_
*
If the test light turns on, the regulator/rectifier is defective.
Replace it.
*
If the test light does not tum on, continue the test.
Regulator Circuit Test-2nd Step:
e Connect the test light and the 12 V battery in the same
manner as specified in the "Regulator Circuit Test·1st
Step'.
e Apply 12 V to the SR (voltage monitoring) terminaL
e Check Y1, Y2, and Y3 terminal respectively.
*11 the test light turns on, the regulator/rectifier is defective.
Replace it.
elf the test light does not turn on, continue the test.
Regulator Circuit Test-3rd Step:
e Connect the test light and the 12 V battery in the same
manner as specified in the
~Regulator
Circuit Test·1 st
Step'.
e Momentarily apply 24 V to the SR terminal by adding a 12
V battery.
eCheck Y1, Y2. and Y3 terminals respectively.
CAUTION
Do not apply more than 24 V to the regulator/recti.
fier and do not leave the 24 V applied for more than
a few seconds, or the unit will be damaged.
*
If the test light did not light when the 24 V was applied
momentarily to the SR terminal, the regulator/rectifier is
defective. Replace it.
*
If the regulator/rectifier passes all of the tests described.
it may still be defective. If the charging system still does
not work property after checking all of the components
and the battery, test the regulator/rectifier by replacing it
with a known good unit.
ELECTRICAL SYSTEM 14-29
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