Norton Commando Workshop Manual

## Electrical

# J

### Testing the rectifier

With alternator leads connected correctly to main harness:
(a) | Disconnect lead from centre terminal at rectifier.
(b) | Connect D.C. voltmeter (with 1 ohm resistor in parallel). Red lead to earth (frame), black lead to rectifier centre terminal (see Fig. J2).
(c) | Start engine and run at approx. 3,000 rev./min.

### CONCLUSIONS:

If meter reading is equal to, or higher than the value stated, the rectifier is satisfactory. A low reading indicates a faulty rectifier. Remove and bench test.

### Bench testing the rectifier

Connect a 12 volt, 45-50 watt bulb and 12 volt battery across terminals 2 and 1 (for a period not exceeding 30 seconds). See Fig. J3.
Repeat test with reversed battery polarity.
Carry out similar tests on terminals: Bolt and 1, Bolt and 3, 2 and 3.
The test lamp shouid illuminate fully in one direction only for each of the connections made.

### CONCLUSIONS:

Rectifier must be replaced if
(a) | Bulb shows sign of illumination in both direction |  | for each connection made
(b) | Bulbshows no sign of illumination in either direction

<< | < | rocbo.net | >