Briggs & Stratton Twin Cylinder L-Head Repair Manual page 110

Alternator output (10, 13 or 16 Amp) is determined by
flywheel alternator magnet size. Therefore, stator and
regulator-rectifier are the same for the 10 and 16 amp
system.
WHEN CHECKING THE ALTERNATOR COM-
PONENTS, MAKE THE TESTS IN THE FOLLOWING
SEQUENCE:
Alternator Output Test
1. Insert RED test lead into
meter.
2. Insert BLACK test lead into COM receptacle in
meter.
3. Rotate selector to V~ (AC volts) position.
4. Insert RED and BLACK test lead probes into out-
put terminals in yellow connector, as shown in
Fig. 24. (Meter test clip leads may be attached to
either terminal.)
BLACK
TEST
CLIP
YELLOW
CONNECTOR
RED
TEST
CLIP
Fig. 24 – Testing AC Output
5. With the engine running at 3600 RPM, output
should be no less than:
*
20 Volts – 10 Amp System
*
20 Volts – 13 Amp System
*
30 Volts – 16 Amp System
*
If alternator output test indicates a 16 Amp system,
see special instructions for testing regulator-rectifier.
6. If no or low output is found, check for bare wires or
any other obvious defects. If "shorted" leads are
not visible, replace the stator.
Regulator-Rectifier Test
NOTE: The Digital Multimeter will withstand DC
input of 10 – 20 Amps for up to 30 seconds.
When checking DC output of 16 Amp
7
NOTE: Regulator-rectifier
receptacle in
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.
Testing Regulator-Rectifier
10 & 13 Amp System
1. Insert RED test lead into 10 A receptacle in meter.
2. Insert BLACK test lead into COM receptacle in
meter.
3. Rotate selector to
4. Attach RED test lead clip to DC output terminal
on regulator-rectifier, Fig. 25.
5. Attach BLACK test lead clip to positive (+)
battery terminal.
6. With the engine running at 3600 RPM. The output
should be:
* Depending upon battery voltage and/or current
draw on system.
7. If no or low output is found, be sure that regulator-
rectifier is grounded properly and all connections
regulated system, use DC Shunt, Tool
#19359, to avoid blowing fuse in meter.
See special instructions for installation
procedure on 16 Amp system, page 12.
will
unless it is grounded to engine. Make sure
the regulator-rectifier is securely mounted
to engine.
Be sure connections are secure. If a test
lead vibrates loose while engine is running,
the regulator-rectifier may be damaged.
(DC amps) position.
RED
CONNECTOR
RED
LEAD
Fig. 25 – Testing Regulator-Rectifier
* 3 – 10 Amps – 10 Amp System
* 3 – 13 Amps – 13 Amp System
not function
BLACK
LEAD
11