13.10
ELECTRICAL
EXAMPLE: Short meter leads together, meter reads 0.7 ohms.
Measure stator resistance, meter reads 1.10 ohms. Subtract 0.7
ohms (meter/lead resistance) from 1.10 ohms (reading
obtained when checking yellow lead to brown lead). True
reading is:1.10 ohms (observed reading when checking stator)
-.7ohms (meter/lead resistance) = 0.4 ohms (true stator
resistance).
2.
Turn the multitester dial to the Volts AC (V~) position.
3.
Disconnect the alternator to main harness connector at
engine.
4.
Connect one of the tester leads to the yellow alternator
wire and the other lead to the brown alternator wire.
NOTE: On floating alternators, the yellow/red stator wire
should connect to the brown stator wire. If it does not, the
system will not have a ground and will not operate.
5.
Start the engine. While observing the voltage reading,
increase the engine speed to about 3000 RPM. Readings of
between 15 and 45 VAC are considered normal.
REGULATED VOLTAGE
1.
Connect the alternator to main harness connector.
2.
Insert one of the tester leads along the side of the yellow
regulator wire connector between the insulation and the
terminal.
3.
Ground the other tester lead.
4.
Start engine and observe headlight output. Increase engine
RPM. If the headlights seem dim above 3500 RPM, let the
engine return to idle and disconnect the yellow wire from
the regulator. Carefully observe the voltage reading. Do
not allow voltage to increase above 14.0 volts.
5.
Slowly increase RPM. Voltage above 12 volts at 2500 -
3000 and a bright headlight, indicates a good lighting coil.
Voltage below 10 volts at 3000 indicates excessive system
loads, poor flywheel magnets, lighting coil problems, or
wires harness problems. Check for partially grounded
(shorted) yellow wire.
6.
Reconnect the yellow regulator wire and increase the
RPM. If the headlight was bright with the regulator
disconnected and dim when connected at the same RPM,
the regulator or regulator ground is at fault.
SHORT CIRCUIT CURRENT (AC Amp Test)
1.
Turn multitester dial to A~.
2.
Connect red lead to 10A terminal.
3.
Connect black lead to Com (-) meter terminal.
4.
Disconnect lighting/charge coil wires from system.
Connect meter leads to coil wires leading to stator coils.
5.
Start and idle engine. Readings should be above 5 amps.
Refer to Amps AC on
page 13.2.
CAUTION: Can blow
meter fuse if used on big alternators.
ALTERNATORS
The difference between a 2 pulse and 6 pulse alternator
system is the number of AC sine waves created by the
alternator in one revolution of the crankshaft. For example, on
a 6 pulse system, the alternator will create 6 pulses, or 6
complete AC sine waves, in one crankshaft revolution. The
tachometer reads these sine waves, therefore giving you
accurate RPM readings. Refer to the following for
applications.
500 Classic = 2 pulse
CAUTION
Can blow meter fuse if used on big alternators.