Regulator/Rectifier
Regulator/Rectifier - Introduction
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 alternator rises, the voltage controller switches the FETs to avoid over voltage on the output.
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.
Regulator/Rectifier - Fault
Fault | Possible cause | Action |
---|---|---|
Battery not charging | Main Fuse | Check the condition of the main 30A fuse: |
Battery | Check the condition of the battery. Refer to the instructions supplied with recommended battery charger to make sure the battery is serviceable. | |
Regulator/Rectifier | Disconnect the black and the grey connectors from the rectifier/regulator and proceed to pinpoint test 1: | |
Alternator | Test the alternator stator (see Alternator Stator). |
Pinpoint Tests
Regulator/Rectifier - Pinpoint Test
Test | Result | Action | |
---|---|---|---|
1 | Check FET 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 | 0.4 V to 0.7 V | Proceed to test 2 |
Open circuit or short circuit | Replace the unit. Proceed to test 4 | ||
2 | Check diodes 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 | 0.1 V to 0.3 V | Proceed to test 3 |
Open circuit or short circuit | Replace the unit. Proceed to test 4 | ||
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 | More than 1.4 V or OL on meter | Proceed to test 4 |
Less than 1.4 V or short circuit | Replace the unit. Proceed to test 4 | ||
4 | Reconnect the harness and run the engine. Check the charging voltage at 2,000 rpm: | 13 V - 15 V | Action complete - quit test |
Fault still present | Test alternator stator (see Alternator Stator) | ||
If alternator stator is serviceable, contact Triumph service |