Norton Commando Workshop Manual

## Electrical

# J

### Testing the D.C. input to battery

(a) | Connect a D.C. ammeter in main battery lead (between battery negative terminal and battery cable), red lead to cable, black lead to battery terminal.
(b) | Ensure Zener Diode is disconnected.
(c) | Start engine and run at approx. 3,000 rev./min.
The following reading will be obtained if the battery and charging systems are in good condition.

Switch Positions | Minimum Current Reading
Ignition Only | 4.5 Amp
Ignition and Lights (Main Beam) | 1.0 Amp

### CONCLUSIONS:

If the readings obtained are higher than the figures quoted, the system is satisfactory. If the readings are lower, proceed to test the alternator itself as in the preceding text.

### SECTION J4

### RECTIFIER TYPE 2DS 506

The rectifier, which is of the silicon crystal bridge connected full wave type, requires no maintenance beyond a periodic check on the cleanliness and security of the terminals. If for any reason the rectifier is removed, DO NOT twist the plates in relation to one another since this will break internal connections and render the rectifier unfit for further service. The centre bolt must be held with a spanner whilst the fixing nut is turned.

VOLTMETER AND RESISTOR ACROSS | MINIMUM VOLTAGE READING
Rectifier (Centre Terminal and Earth (frame) | 7.5

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