Rectifier/Regulator; Pinpoint Tests - Triumph Rocket III Classic Service Manual

Electrical System
Rectifier/Regulator
Internally the rectifier/regulator consists of three diodes,
one between each input and the positive terminal, and
three field effect transistors (FETs), one between each
input and the ground terminal.
As the voltage of the AC signal from the generator rises,
the voltage controller switches the FETs to avoid over
voltage on the output.
Fault Possible cause
Battery not charging Fuse 11
Battery
Rectifier/Regulator
Alternator
Pinpoint Tests
Test
1 Check diodes forward bias:
- Positive
(+)
probe to rectifier black socket pin 1 to:
Negative (-) probe to rectifier grey socket pin 1
Negative (-) probe to rectifier grey socket pin 2
Negative (-) probe to rectifier grey socket pin 3
2 Check FET function forward bias:
- Negative (-) probe to rectifier black socket pin 3 to:
Positive
(+)
probe to rectifier grey socket pin 1
Positive
(+)
probe to rectifier grey socket pin 2
Positive
(+)
probe to rectifier grey socket pin 3
3 Check diodes reverse bias:
- Negative (-) probe to rectifier black socket pin 1 to:
Positive
(+)
probe to rectifier grey socket pin 1
Positive
(+)
probe to rectifier grey socket pin 2
Positive
(+)
probe to rectifier grey socket pin 3
- Positive
(+)
probe to rectifier black socket pin 3 to:
Negative (-) probe to rectifier grey socket pin 1
Negative <-> probe to rectifier grey socket pin 2
Negative (-) probe to rectifier grey socket pin 3
The diodes and FETs can be checked using a multimeter
on DIODE setting. Disconnect the two electrical
connectors from the rectifier/regulator and check the
readings as indicated below.
Note:
• This test does not check for voltage regulation.
Action
Check the condition of fuse 11:-
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:-
Disconnect the black and the grey
connectors from the rectifier/
regulator and proceed to pinpoint
test 1:-
Test alternator stator (see page
18-
28)
Result Action
O.4V to 0.7V Proceed to test 2
Open circuit or Replace the unit. Proceed to
short circuit
test 4
O.lV to 0.3V Proceed to test 3
Open circuit or Replace the unit. Proceed to
short circuit test 4
More than 1.4V Proceed to test 4
or OL on meter
Less than l.4V or Replace the unit. Proceed to
short circuit test 4
18.30
Service Manual - Rocket 1111 Classic I Touring