Alternator/Charging System; Diagnosis- Charging Circuit - Triumph DAYTONA 675 Service Manual

General Information

Alternator/Charging System

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 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 clean 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 17-19).
•
Rectify any defects as necessary.
Diagnosis - Charging Circuit
ENSURE THE BATTERY IS IN GOOD
CONDITION AND FULLY CHARGED.
CHECK ALL BATTERY AND GROUND
TERMINALS ARE CLEAN AND TIGHT
WITH THE ENGINE RUNNING AT
AROUND 2000 RPM, MEASURE THE
BATTERY VOLTAGE AT THE BATTERY.
THE BATTERY VOLTAGE SHOULD BE
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
1.18
Service Manual - Daytona 675, Street Triple and Street Triple R
OK
14.5 ±0.5 VOLTS
Below
14 Volts
WIRE
RECHARGE OR REPLACE FAULTY
Not OK
I
BATTERY AND/OR REPAIR DIRTY/
LOOSE CONNECTIONS
OK
Above
15 Volts
FAULTY RECTIFIER/ REGULATOR
P
Below 30
Volts AC
FAULTY ALTERNATOR
L UMP