Alternator Stator; Pinpoint Tests - Triumph Thunderbird Service Manual

Electrical System
Alternator Stator
The stator is an assembly of 18 coils, arranged in to three
phases. It is possible to check for continuity and short
circuits through the coils and to earth.
Note:
• Only repair the stator harness between the
rectifier and where the harness goes into the
crankcase.
•
•
•
Do not attempt to repair the stator coils.
If the battery is not fully charged, the charging
Voltage may be lower than specified when
checking at 2,000 rpm.
Ensure all additional accessories (auxiliary
lights, heated grips etc.> are switched off.
Fault Possible cause Action
Battery not charging Fuse 11 Check the condition of fuse 11:-
Battery Check the condition of the battery.
Test the battery using the BatteryMate
150-9. Refer to
the instructions
supplied with the BatteryMate 150-9.
Ensure the battery is serviceable:-
Alternator Proceed to pinpoint test 1:-
Rectifier/Regulator Test the rectifier/regulator
(see
page
18-24)
Pinpoint Tests
Test
1 Check cable and terminal integrity:
- Battery positive
(+)
- Battery negative (-)
- rectifier/regulator black connector pin 1
- rectifier/regulator black connector pin 3
- rectifier/regulator grey connector pin 1
- rectifier/regulator grey connector pin 2
- rectifier/regulator grey connector pin 3
Result
OK
Faulty
Action
Disconnect the battery leads, negative (black>
lead first. Disconnect rectifier/regulator black
connector and proceed to test 2
Rectify fault, proceed to test 4
2 Check cable continuity OK
- rectifier/regulator black connector pin 1 to
battery lead negative connector
- rectifier/regulator black connector pin 3 to
battery lead positive connector
Open circuit
Reconnect the battery leads, positive (red)
lead first. Reconnect the rectifier/regulator
black connector. Disconnect the rectifier/
regulator grey connector and proceed to test
3
Locate and rectify wiring fault, proceed to test
4
3 Check resistance through the coils:
- Alternator pin 1 to pin 2
- Alternator pin 2 to pin 3
- Alternator pin 3 to pin 1
0.14Q to 0.18Q
Open circuit
short circuit
Proceed to test 4
or If the fault is between the rectifier and the
crankcase, repair the harness. Proceed to test
4
If the fault is after the crankcase, replace the
unit. Proceed to test 5
4 Reconnect the harness and run the engine. 13.5V - 15V
Check the charging Voltage at 2,000 rpm:
Fault still present
Action complete - quit test
Disconnect the rectifier/regulator grey
connector and proceed to test 5
18.22
Service Manual - Thunderbird