Test Lighting Circuit (-Dc); Batteries - Briggs & Stratton Twin Cylinder L-Head Repair Manual

When testing regulator-rectifier for amperage output a
12 volt battery with a minimum charge of 5 volts is
required. There will be no charging output if battery
voltage is below 5 volts.
NOTE: Connect test leads before starting engine.
Be sure connections are secure. If a test
lead vibrates loose while engine is running,
regulator-rectifier may be damaged.
1. Insert RED test lead into 10 A receptacle in meter.
2. Inset BLACK test lead into COM receptacle in
meter.
3. Rotate selector to
4. Attach RED test lead clip to charging output pin
(red wire), Fig. 30.
5. Attach BLACK test lead clip to positive (+)
battery terminal.
RED TEST
OUTPUT PIN
CLIP
RED WIRE
Fig. 30 – Testing Regulator Output
6. With engine running at 3600 RPM output should
be 3 to 8 amps.
Amperage will vary with battery voltage, for example, if
battery voltage was below 11 volts output reading
would be approximately 8 amps. If battery voltage is at
its maximum, the amperage will be less.
7. If no output or low output is found, replace regu-
lator-rectifier.

Test Lighting Circuit (-DC)

The black wire from the regulator-rectifier provides 8
amps (-) DC and is used only for lighting. If the
headlights do not operate, make sure that the problem
is not with the bulbs, wiring and/or light switch.
To test the lighting circuit the following tools are
required Fig. 31.
(DC amps) position.
BLACK
TEST CLIP
7
1 OHM 20 WATT
RESISTOR
(AVAILABLE FROM ELECTRIC
SUPPLY HOUSE)
(MAKE FROM 393362
ALTERNATOR HARNESS)
Fig. 31 – Test Equipment
1. Insert RED test lead into 10 A receptacle in meter.
2. Inset BLACK test lead into COM receptacle in
meter.
3. Rotate selector to
4. Connect test harness to output connector and attach
alligator clips to 1 ohm 20 watt resistor as shown in
Fig. 32.
5. Attach RED test lead clip to resistor, and BLACK
test lead clip to positive (+) battery terminal.
RED
LEAD
WHITE
CONNECTOR
TEST
PLUG
REGULATOR
RECTIFIER
RESISTOR
Fig. 32 – Testing Lighting Circuit
6. With engine running at 3600 RPM output on the
meter should be approximately 8 amps.
7. If no output or low output is found, replace the
regulator-rectifier.
CAUTION: CONDUCT TEST AS QUICKLY AS
POSSIBLE. RESISTOR GETS HOT!

BATTERIES

The battery supplied by equipment manufacturers
used with Briggs & Stratton Twin Cylinder Engines is of
the 12 volt, lead acid-wet cell type. This type is
available as a maintenance free or dry charge battery.
The maintenance-free battery is filled with electrolyte
at the time of manufacture. The level of electrolyte can
not be checked, Fig. 33.
TEST PLUG
(DC amps) position.
BLACK
LEAD
BATTERY
15