Testing Charge Indicator; Quad Circuit Alternator; Alternator Output Test; Testing Regulator-Rectifier - Briggs & Stratton Twin Cylinder L-Head Repair Manual

7

Testing Charge Indicator

It is important that the test procedure be done in a
systematic manner to identify whether the problem is
related to the regulator-rectifier or the charging indica-
tor wiring system. Follow test procedure in the
sequence listed.
A known good battery is required for this test.
BEFORE TESTING THE CHARGING INDICATOR
SYSTEM, TEST THE ALTERNATOR AND REGULA-
TOR-RECTIFIER FOR CORRECT OUTPUT.
NOTE:Output values are the same as the 10
amp and 16 amp system.
Symptom – Indicator Light Will Not Light – Key
Switch On – Engine Not Running
A jumper wire is required for this test.
Make sure key switch is in OFF position before
connecting jumper wire.
IMPORTANT: Before disconnecting output harness
from connector, mark or identify the charging indicator
wire in the output harness. If jumper wire contacts
charging output wire during test while key switch is in
ON position, wiring harness may be damaged.
1. Disconnect output harness at white connector.
2. Attach one end of jumper wire to a good ground.
3. Attach other end of jumper wire to charge indicator
terminal in output harness connector, Fig. 28.
a. Turn key switch to ON position.
b. If bulb lights, charge indicator wiring system is
OK. Replace regulator-rectifier.
c. If bulb does not light, replace bulb.
d. If new bulb does not light, the problem must be
a broken wire (open circuit) in charging indica-
tor circuit. Refer to typical wiring diagram,
page 13.
ON
BULB
CHARGE
INDICATOR
WIRE
TERMINAL
WHITE
CONNECTOR
JUMPER
WIRE
Fig. 28 – Testing Charge Indicator
Symptom – Indicator Light Stays On – Engine
Running
NOTE: Indicator light will remain on if battery
voltage is below 12 volts.
1. Check indicator light wiring.
a. If wiring is grounded, light will remain on when
engine is running.
b. If wiring is OK, replace regulator-rectifier.
14

QUAD CIRCUIT ALTERNATOR

The quad circuit alternator system provides AC current
through two output leads to the regulator-rectifier. The
regulator-rectifier converts AC current to DC and
provides regulated current (8 amps + DC) for charging
the battery and unregulated current (8 amps – DC) for
lighting. The charging rate will vary with engine RPM
and temperature.
WHEN CHECKING ALTERNATOR COMPONENTS,
MAKE TESTS IN THE FOLLOWING SEQUENCE:

Alternator Output Test

1. Insert RED test lead into
2. Insert BLACK test lead into COM receptacle in
3. Rotate selector to V~ (AC volts) position.
4. Attach RED test lead clip to one of the output pins
5. Attach BLACK test lead clip to the other output pin.
6. With engine running at 3600 RPM, AC output
7. If no or low output is found, replace stator.
CONNECTOR
OUTPUT
HARNESS

Testing Regulator-Rectifier

Test Charging Circuit (+DC)

NOTE: The quad circuit and 10 – 16 amp regu-
lated system use the same stator.
meter.
meter.
in the yellow connector, Fig. 29.
(Test lead clips may be attached to either output
pin.)
should be no less than 30 volts AC.
BLACK
LEAD
YELLOW
RED
LEAD
Fig. 29 – Testing AC Output
NOTE: Regulator-rectifier
unless it is grounded to engine. Make sure
the regulator-rectifier is securely mounted
to engine.
receptacle in
will not function