Triumph TIGER Service Manual page 22

The charging system consists of an alternator and a
rectifier/ regulator assembly and the battery. The
alternator is made up of two parts, the stator, which is
mounted to the crankcase or the engine cover, and the
rotor, mounted to the end of the crankshaft. The stator is
an assembly of 18 coils, arranged into 3 phases. The rotor
is a series of magnets mounted in the engine flywheel,
which are arranged so as to be positioned around the
outside of the stator coils. As the engine rotates the
alternator produces an ac (alternating current) voltage in
each of the three phases of the alternator, typically of
around 35 to 40 volts ac at 4000-5000 rpm, although
this figure varies between models. As the battery requires
dc (direct current) voltage for correct charging, this ac
voltage must be first rectified to dc current, and then
regulated to the correct voltage for the battery of 14.5
±0.5 volts. This is done by the rectifier/regulator, which
i
ENSURE THE BATTERY IS IN GOOD
CONDITION AND FULLY CHARGED.
CHECK ALL BATTERY AND GROUND
TERMINALS ARE CLEAN AND TIGHT
OK
WITH THE ENGINE RUNNING AT
AROUND 2000 RPM,
BATTERY VOLTAGE
THE BATTERY VOLTAGE SHOULD BE
14.5 ±0.5 VOLTS
Below
14 Volts
STOP THE ENGINE AND DISCONNECT THE
ALTERNATOR CONNECTOR. RE-START
THE ENGINE AND ALLOW TO IDLE.
MEASURE THE ALTERNATING CURRENT
(AC) VOLTAGE FROM THE 3 ALTERNATOR
OUTPUT.WIRES IN TURN.
THE OUTPUT VOLTAGE MUST EXCEED 10
VOLTS AC FROM EACH WIRE
Above 10
Volts AC
RAISE THE
ENGINE SPEED ABOVE
4000 RPM. MEASURE THE
ALTERNATING CURRENT (AC)
VOLTAGE FROM THE 3 ALTERNATOR
OUTPUT WIRES IN TURN.
THE OUTPUT VOLTAGE MUST NOW
EXCEED 30 VOLTS AC FROM EACH
Above 30
Volts AC
FAULTY RECTIFIER( REGULATOR
nW!I1
.
Not OK
i
i
Above
MEASURE THE
15 Volts
THE BATTERY.
AT
Below 30
Volts
WIRE
Service Manual -Ti9er
1s
uses diodes to convert the alternator output to dc volts
and limit the resulting output to the correct figure
required for optimal battery charging.
If the charging circuit does not operate correctly, the
following basic checks must be carried out before further
diagnosis is performed:
® Check the battery terminals are dean and
tight.
• Check the frame and engine earth
connections are clean, tight and free from
corrosion.
• Ensure the battery is fully charged and in
good condition.
• Check that any fuse in the circuit is not blown
and is of the correct rating (See page
Rectify any defects as necessary.
RECHARGE OR REPLACE
BATTERY AND/OR REPAIR DIRTY/
LOOSE CONNECTIONS
OK
FAULTY RECTIFIER/ REGULATOR
AC
FAULTY ALTERNATOR
•
t:iiiI Information
17-19.
FAULTY
1.15